Four people gunned down in the French Alps had each been shot twice in the head, prosecutors have revealed.

Saad al-Hilli, 50, was killed in his car alongside his dentist wife, named by neighbours as Iqbal, on Wednesday.

An older Swedish woman travelling in the car also died in the shooting, along with Sylvain Mollier, 45, a French cyclist who apparently stumbled across the attack in Chevaline.

alps muder

A police officer accepts flowers outside the home of French shooting victim, Saad al-Hilli

The couple's four-year-old daughter Zeena lay undiscovered under her mother's corpse for eight hours after the murders, while her seven-year-old sister Zainab remains in a medically induced coma after being shot and beaten.

Post-mortem examinations revealed each of the victims killed in the attack had been shot a number of times, including two hits to the head, public prosecutor Eric Maillaud said.

Police are searching the al-Hillis' family home today in Claygate, in Surrey, after a team of four French officers arrived in the UK.

The caravan which the family had been staying in at the Le Solitaire du Lac campsite in Saint-Jorioz was also removed by police.

French authorities have now asked their Italian and Swiss counterparts to help them in their hunt for those responsible.

Surrey Police erected a tent at the front of the al-Hillis' home today as they prepared to conduct a search of the property with the French police team, led by officer Marc de Tarle.

Two French detectives entered the house earlier with British officers, while scenes of crimes officers in full protective suits are continuing the search this afternoon.

Families have been visiting the home throughout the day to leave floral tributes outside the front of the house. Along with bouquets of flowers, teddy bears had been left and a Mr Men 'Little Miss Trouble' book.

Two relatives of the al-Hilli family have travelled to France, alongside a British social worker, and will visit the girls who are under police supervision.

However it was unclear when they would be able to see the elder girl, Zainab, as she continues to be treated in hospital.

Mr Maillaud said the identities of the relatives who had arrived in France would not be made public for "security reasons".

Police plan to look at aspects of Mr al-Hilli's life to try to find a motive for the murders and also speak with his brother, named in reports as Zaid Hilli.

surrey detectives

British and French police officers outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey

Investigators have disclosed that Mr al-Hilli's brother approached UK police to deny any feud with his sibling over money.

Speaking at a press conference today, Mr Mauillard said the brother would be interviewed along with the rest of the al-Hilli family as part of the investigation.

He said: "He will be interviewed just as all of the rest of the al-Hilli family, who are going to be identified in the coming days."

The al-Hillis' four-year-old daughter has spoken to police and confirmed that two of the victims were her parents, but said she did not know the Swedish woman very well.

Mr Maillaud said they were working with Swedish authorities as they try to confirm the woman's relationship to the family.

Witnesses have said they saw a green four-wheel-drive vehicle in the area at the time of the killings, and possibly a motorbike.

All the victims were shot at least three times and investigators have found 25 spent bullet cartridges at the scene on the outskirts of a forest near Lake Annecy.

Mr Maillaud said the family had visited France a number of times before and it was not the first time they had been to Le Solitaire du Lac campsite.

One theory is that shots could have been fired during a bungled armed robbery, with Mr Mollier being a witness to the crime.

But speculation about other possible motives, including a pre-planned attack by professional hitmen, remained rife.

Some media reports have suggested that Mr al-Hilli, an engineer who left Saddam Hussein's Iraq several years ago, was known to the security services and was put under surveillance by Metropolitan Police Special Branch during the second Gulf war.

A Scotland Yard spokesman said they could not comment. But it is understood there is no link between the deaths and any national security issues.

In a joint statement by British and French officers outside Woking police station, Assistant Chief Constable Rob Price said Surrey police have sent family liaison officers to France.

The head of operations for Surrey police said: "This is a French-led investigation.

"Surrey police will do all we can in the support of the effective investigation on behalf of our French colleagues.

"Throughout that support I want to place the emphasis on the victims of this tragic incident and Surrey police, again working with our French colleagues, will be ensuring all those who need support will get the support.

"Specifically, Surrey police have deployed specially trained family liaison officers both here in the UK and abroad in France."

Colonel Marc de Tarle of the Gendarmerie said cooperation "both on the human level and the technical level" between the British and French authorities was going smoothly.

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  • Police around the BMW at scene of shooting in woods near Chevaline in the French Alps where british family and cyclist were shot dead

  • Police around the BMW at scene of shooting in woods near Chevaline in the French Alps where british family and cyclist were shot dead

  • French gendarmes talk with investigators near the caravan of the British family hit by gun attack on September 6, 2012 in the camping "Le Solitaire du lac" in the French Alpine village of Saint-Jorioz. A four-year-old girl spent hours curled up under her mother's body and miraculously survived the deadly attack that left her father, mother and grandmother dead and her elder sister seriously injured, officials said. (Photo credit: PHILIPPE DESMAZES/AFP/GettyImages)

  • A French gendarme stands guard near the caravan of the British family hit by gun attack on September 6, 2012 in the camping "Le Solitaire du lac" in the French Alpine village of Saint-Jorioz. A four-year-old girl miraculously survived the deadly attack that left her father, mother and grandmother dead and her elder sister seriously injured, officials said. (Photo credit: PHILIPPE DESMAZES/AFP/GettyImages)

  • A vehicle of rescuers arrives on Septembre 6, 2012, where four people were shot dead in or close to a British-registered car that was found in a forest car park on the edge of the French Alpine village of Chevaline. The car, a BMW, contained the bodies of a man, in the front, and two women who were seated in the back, police said. (Photo credit: JEAN-PIERRE CLATOT/AFP/GettyImages)

  • A road sign is seen while a Gendarme blocks access to a killing site near Chevaline, French Alps, Wednesday Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps. An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps. An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps.An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps.An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps.An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday, Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps. An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo / Alexis Moro)

  • Gendarmes block access to a killing site near Chevaline, French Alps, Wednesday, Sept. 5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps. An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo / Alexis Moro)

  • A Gendarme's car heads to a killing site near Chevaline, French Alps, Wednesday Sept.5, 2012. French authorities say at least four people have been shot to death in a forest in the Alps. An official with the regional administration for the Haute-Savoie region says three of the bodies were found in a BMW registered in Britain. (AP Photo/Alexis Moro)

  • Alps shooting

    Members of the public arrive with flowers at the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    A police officer accepts flowers outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    A police officer lays flowers outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    British Scenes of Crime Officers (SOCO) outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    A British Scenes of Crime Officer (SOCO) outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    A British Scenes of Crime Officer (SOCO) outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    British Scenes of Crime Officers (SOCO) outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    British Scenes of Crime Officers (SOCO) outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    Forensic officers outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    Forensic officers outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    British police forensic officers Saturday Sept. 8, 2012, outside the home of Saad al-Hilli, in Claygate, Britain, during investigations into the death of four people shot dead on Wednesday in the French Alps. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family members while vacationing in France. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    British Scenes of Crime forensic officers (SOCO) Saturday Sept. 8, 2012, outside the home of Saad al-Hilli, in Claygate, Britain, during investigations into the death of four people shot dead on Wednesday in the French Alps. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family members while vacationing in France. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    British police officers places flower tributes Saturday Sept. 8, 2012, outside the home of Saad al-Hilli, in Claygate, Britain, during investigations into the death of four people shot dead on Wednesday in the French Alps. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family members while vacationing in France. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    British police forensic officers Saturday Sept. 8, 2012, outside the home of Saad al-Hilli, in Claygate, Britain, during investigations following the deaths of four people shot dead on Wednesday in the French Alps. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family members while vacationing in France. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    The home of Saad al-Hilli, in Claygate, Britain, who was shot dead on Wednesday with three others while vacationing in the French Alps, as it is secured by British police Saturday Sept. 8, 2012. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    British police secure the area Saturday Sept. 8, 2012, outside the home of Saad al-Hilli, in Claygate, Britain, who was shot dead on Wednesday with three others while vacationing in the French Alps. French police officers are expected to arrive Saturday in Britain as part of an investigation into the slayings of the British-Iraqi al-Hilli family. The children of the al-Hilli family survived the killing, as 4-year-old daughter Zeena stayed hidden below the body of her dead mother, and 7-year-old Zaina who was shot in the shoulder and beaten. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

  • Alps shooting

    The home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    Police outside the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as French police investigating the murder of four people are sending four officers to the UK to work with British detectives and plan to search the house of victim Saad al-Hilli.

  • Alps shooting

    Police on Thursday Sept. 6, 2012 stand outside the home of Saad al-Hilli in Claygate, Surrey, who has been named by French media as one of the members of a British family who was shot dead by a gunman in the French Alps. (AP Photo/Steve Parsons/PA) UNITED KINGDOM OUT NO SALES NO ARCHIVE

  • General view of the hospital of Grenoble , France, Thursday, Sept. 6, 2012, where the young British girl is hospitalized after four people were found shot to death on a forest road, last Wednesday, in the French alps. Immobilized with fear, a 4-year-old British girl huddled for eight hours beneath the legs of her slain mother in the back of a car filled with corpses on a remote Alpine road — all while French investigators stood nearby, unaware the girl was there. The stunning discovery Thursday of the girl, apparently unharmed, heightened the drama around a mysterious shooting rampage that left four adults dead and a 7-year-old girl hospitalized with bullet wounds and skull fractures. The reason for the killing, in a wooded area near the village of Chevaline, remains unclear. (AP Photo/Lionel Cironneau)

  • General view of the hospital of Grenoble , France, Thursday, Sept. 6, 2012, where the young british girl is hospitalized after four people were found shot to death on a forest road, on Wednesday, in the French alps. Immobilized with fear, a 4-year-old British girl huddled for eight hours beneath the legs of her slain mother in the back of a car filled with corpses on a remote Alpine road — all while French investigators stood nearby, unaware the girl was there. The stunning discovery Thursday of the girl, apparently unharmed, heightened the drama around a mysterious shooting rampage that left four adults dead and a 7-year-old girl hospitalized with bullet wounds and skull fractures. The reason for the killing, in a wooded area near the village of Chevaline, remains unclear. (AP Photo/Lionel Cironneau)

  • Alps shooting

    A Royal Logistic Corps bomb disposal truck arrives at the cordon close to the home of Saad al-Hilli in Claygate, Surrey, as police evacuated an area around his home due to "concerns" about items found at the address.

  • Alps shooting

    A Royal Logistic Corps bomb disposal truck arrives at the cordon close to the home of Saad al-Hilli in Claygate, Surrey, as police evacuated an area around his home due to "concerns" about items found at the address.

  • Alps shooting

    Police close to the home of Saad al-Hilli in Claygate, Surrey, as they evacuated an area around his home due to "concerns" about items found at the address.

  • Alps shooting

    Police stand outside the home of Saad al-Hilli in Claygate, Surrey, who has been named by French media as one of the members of a British family who was shot dead by a gunman in the French Alps.

  • Alps shooting

    Police walk close to the home of Saad al-Hilli in Claygate, Surrey, as they evacuated an area around his home due to "concerns" about items found at the address.

  • Alps shooting

    Police close to the home of Saad al-Hilli in Claygate, Surrey, as they evacuated an area around his home due to "concerns" about items found at the address.

  • Alps shooting

    Police search teams leave the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, after police resumed their search at the home of the family gunned down in the French Alps.

  • Alps shooting

    A police firearms officer at the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as police resumed their search at the home of the family gunned down in the French Alps.

  • Alps shooting

    Police firearms officers at the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as police resumed their search at the home of the family gunned down in the French Alps.

  • Alps shooting

    Police at the home of French shooting victim, Saad al-Hilli in Claygate, Surrey, as police resumed their search at the home of the family gunned down in the French Alps.

  • Saad al-Hilli killed in the French Alps