The fate of "fewer than ten" British nationals caught up in the Algerian hostage crisis remains unknown as the four-day stand-off in the desert came to a bloody climax on Saturday.

Foreign Secretary William Hague said that while the large majority of Britons at the BP gas plant at In Amenas were now safe, the country needed to be prepared for more "bad news".

"As of now there are fewer than ten British nationals at risk or unaccounted for. But that of course means that we continue to prepare ourselves bad news," he said.

Defence Secretary Philip Hammond said the Government had received information that the hostage situation "has now been brought to an end".

He described the loss of life as "appalling and unacceptable".

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Hammond and Panetta in a joint news conference on Saturday afternoon

"We remain in close contact with the Algerian government," he told a joint news conference with US defence secretary Leon Panetta. "We remain determined to defeat terrorism and stand with the Algerian government."

The Algerian state news agency, APS, reported that seven hostages died as Algerian special forces mounted a "final assault" on the last terrorists holding out at the sprawling gas facility.

Eleven of the militants were also reported to have died in the shoot-out.

Hague, who chaired a meeting of the Government's Cobra emergencies committee, said he had spoken to the Algerian foreign minister but made no mention of Saturday's fighting.

irish hostage

The hostage situation has been underway since Wednesday

"This whole incident underlines the scale and ruthlessness of the terrorist threat that we and other nations face," he said.

"We underline our resolve to deal with that and to defeat terrorism and murder, working with allies across the world, including in north Africa."

He said that a consular team was now on the ground in In Amenas providing assistance to those Britons who had escaped while the ambassador Martyn Roper was travelling to the area.

The situation at the plant remained unclear, with reports that 16 foreign nationals - including two Americans, two Germans and a Portuguese - had been freed.

APS quoted an Algerian security source as saying that the hostages who died had been killed by their captors.

Earlier, the kidnappers - who call themselves the Masked Brigade or "The Signers in Blood" - told a Mauritanian news agency they are in contact with that they were holding seven foreigners - one British, three Belgians, two Americans and one Japanese.

algeria hostage crisis

The In Anemas hostages included Americans, Britons, Germans, Japanese and Portuguese

The drama began on Wednesday when a group of about 30 heavily-armed militants mounted a dawn raid at the plant close to the Libyan border, seizing hostages from among the 700 Algerian and foreign workers at the site.
Two workers - including one Briton - died in the initial assault.

The following day, Algerian special forces mounted an operation to take back the plant - to the initial dismay of the British and other governments, who were not notified in advance despite offering assistance to the Algerian authorities.

By Friday, APS was reporting that about 100 foreigners - from a total of 132 - and 573 Algerians had been freed, with a "provisional" figure of 12 hostages and 18 militants who had been killed in the fighting - although the militants claimed 35 foreigners had died.

However, it was also clear that a group of militants, still holding hostages, was continuing to hold out.

Hague said that he would be chairing a further meeting of the Cobra emergencies committee later today and that David Cameron - who is following events from Chequers - would be speaking to Algerian prime minister Abdelmalek Sellal.

"This has been and remains an Algerian operation, and our priority is the safety and welfare of our nationals. We continue to work hard on that," he said.

william hague

Hague earlier said the hostage crisis was the Government's 'top priority' until all were accounted for

Despite the casualties among the hostages, an Algerian government source quoted on Friday by APS strongly defended the military operation, saying it prevented a "true disaster" which would have caused "immeasurable" human and material damage.

The rescue mission was carried out in "extremely complex circumstances" against terrorists armed with a huge arsenal of missiles, rocket launchers, grenades and assault rifles, the source said.

Swift action was the "only way to minimise or neutralise the deadly intent of the multinational terrorists - but not without the inevitable risks in all such situations".

It has been reported that two UK workers are among the casualties, which would bring the British death toll to three after one was killed in Wednesday's initial raid by the militants.

As freed hostages began to leave the plant, accounts emerged at their horrific treatment at the hands of the kidnappers.

One Algerian worker, who gave his name only as Chabane, described how from his hiding place he heard the militants speaking among themselves with Libyan, Egyptian and Tunisian accents. At one point, he said, they caught a Briton.

"They threatened him until he called out in English to his friends, telling them 'Come out, come out. They're not going to kill you. They're looking for the Americans'," he said.

"A few minutes later, they blew him away."

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  • An unidentified rescued hostage speaks to the media in a hospital Ain Amenas, Algeria, in this image taken from television Friday Jan. 18, 2013. Algeria’s state news service says nearly 100 out of 132 foreign hostages have been freed from a gas plant where Islamist militants had held them captive for three days. The APS news agency report was an unexpected indication of both more hostages than had previously been reported and a potentially breakthrough development in what has been a bloody siege. (AP Photo/Canal Algerie via Assiaciated Press TV) ** TV OUT ALGERIA OUT **

  • Unidentified rescued hostages pose for the media in Ain Amenas, Algeria, in this image taken from television Friday Jan. 18, 2013. Algeria’s state news service says nearly 100 out of 132 foreign hostages have been freed from a gas plant where Islamist militants had held them captive for three days. The APS news agency report was an unexpected indication of both more hostages than had previously been reported and a potentially breakthrough development in what has been a bloody siege. (AP Photo/Canal Algerie via Associated Press TV) ** TV OUT ALGERIA OUT **

  • Algerian special police unit officers secure the hospital in Ain Amenas, Algeria, Friday, Jan. 18, 2013, two days after the start of the terrorist attack at a gas plant. The hostage crisis in the remote desert of Algeria is not over, Britain said Friday, after an Algerian raid on the gas plant to wipe out Islamist militants and free their captives from at least 10 countries unleashed bloody chaos. (AP Photo/Anis Belghoul)

  • An unidentified rescued hostage receives treatment in a hospital in Ain Amenas, Algeria, in this image taken from television Friday Jan. 18, 2013. Algeria’s state news service says nearly 100 out of 132 foreign hostages have been freed from a gas plant where Islamist militants had held them captive for three days. The APS news agency report was an unexpected indication of both more hostages than had previously been reported and a potentially breakthrough development in what has been a bloody siege. (AP Photo/Canal Algerie via Associated Press TV) ** TV OUT ALGERIA OUT **

  • An unidentified rescued hostage speaks to the media in a hospital in Ain Amenas, Algeria, in this image taken from television Friday Jan. 18, 2013. Algeria’s state news service says nearly 100 out of 132 foreign hostages have been freed from a gas plant where Islamist militants had held them captive for three days. The APS news agency report was an unexpected indication of both more hostages than had previously been reported and a potentially breakthrough development in what has been a bloody siege. (AP Photo/Canal Algerie via Associated Press TV) ** TV OUT ALGERIA OUT **

  • This image from video provided by the SITE Intel Group made available Thursday Jan. 17, 2013, purports to show militant militia leader Moktar Belmoktar. Algerian officials scrambled Thursday Jan. 17, 2013 for a way to end an armed standoff deep in the Sahara desert with Islamic militants who have taken dozens of foreigners hostage, turning to tribal Algerian Tuareg leaders for talks and contemplating an international force. The group claiming responsibility — called Katibat Moulathamine or the Masked Brigade — says it has captured 41 foreigners, including seven Americans, in the surprise attack Wednesday on the Ain Amenas gas plant. Algerian Interior Minister Daho Ould Kabila said the roughly 20 well armed gunmen were from Algeria itself, operating under orders from Moktar Belmoktar, al-Qaida's strongman in the Sahara. (AP Photo/SITE Intel Group) THE ASSOCIATED PRESS HAS NO WAY OF INDEPENDENTLY VERIFYING THE CONTENT, LOCATION OR DATE OF THIS PICTURE. MANDATORY CREDIT: SITE Intel Group

  • This April 19, 2005 photo released by Statoil via NTB scanpix, shows the Ain Amenas gas field in Algeria, where Islamist militants raided and took hostages Wednesday Jan. 16, 2013. As Algerian army helicopters clattered overhead deep in the Sahara desert, Islamist militants hunkered down for the night in the natural gas complex they had assaulted Wednesday morning, killing two people and taking dozens of foreigners hostage in what could be the first spillover from France's intervention in Mali. (AP Photo/Kjetil Alsvik, Statoil via NTB scanpix) NORWAY OUT

  • This April 19, 2005 photo released by Statoil via NTB scanpix, shows the Ain Amenas gas field in Algeria, where Islamist militants raided and took hostages Wednesday Jan. 16, 2013. As Algerian army helicopters clattered overhead deep in the Sahara desert, Islamist militants hunkered down for the night in the natural gas complex they had assaulted Wednesday morning, killing two people and taking dozens of foreigners hostage in what could be the first spillover from France's intervention in Mali. (AP Photo/Kjetil Alsvik, Statoil via NTB scanpix) NORWAY OUT

  • JGC Corporation, or Nikki Manager of public relations Takeshi Endo, foreground, answers reporters' questions following Wednesday's attack at a natural gas complex in Algeria which involves the company's workers, at its headquarters in Yokohama, near Tokyo Thursday, Jan. 17, 2013. A militant group that claimed responsibility said 41 foreigners were being held after the assault on one of oil-rich Algeria's energy facilities. Two foreigners were killed. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE

  • Helge Lund

    Statoil Chief Executive Helge Lund answers questions about the situation in the gas field, jointly operated by BP, the Norwegian energy company Statoil and the Algerian state oil company Sonatrachfield along with Japanese company JGC Corp., in Ain Amenas in Algeria during a press briefing in Stavanger, Norway, Thursday, Jan. 17, 2013. In a desert standoff deep in the Sahara, the Algerian army ringed the natural gas complex where Islamist militants hunkered down with dozens of hostages Wednesday night after a rare attack that appeared to be the first violent shock wave from the French intervention in Mali. (AP Photo/NTB Scanpix, Kent Skibstad) NORWAY OUT

  • Helge Lund

    Statoil Chief Executive Helge Lund answers questions about the situation in the gas field, jointly operated by BP, the Norwegian energy company Statoil and the Algerian state oil company Sonatrachfield along with Japanese company JGC Corp., in Ain Amenas in Algeria during a press briefing in Stavanger, Norway, Thursday, Jan. 17, 2013. In a desert standoff deep in the Sahara, the Algerian army ringed the natural gas complex where Islamist militants hunkered down with dozens of hostages Wednesday night after a rare attack that appeared to be the first violent shock wave from the French intervention in Mali. (AP Photo/NTB Scanpix, Kent Skibstad) NORWAY OUT

  • STATOIL

    Statoil spokesman Ole Anders Skauby, centre right, talks to TV reporters outside Scandic Bergen Airport hotel where a drop-in center is established for relatives of hostages involved in the situation in Algeria. Militants are holding a number of foreigners hostages in the Sahara desert in revenge for Algeria's support of French efforts to remove Islamists from control of neighboring northern Mali. (AP Photo / Hakon Mosvold Larsen / NTB scanpix) NORWAY OUT

  • An unidentified rescued hostage receives treatment in a hospital Ain Amenas, Algeria, in this image taken from television Friday Jan. 18, 2013. Algeria’s state news service says nearly 100 out of 132 foreign hostages have been freed from a gas plant where Islamist militants had held them captive for three days. The APS news agency report was an unexpected indication of both more hostages than had previously been reported and a potentially breakthrough development in what has been a bloody siege. (AP Photo/Canal Algerie via Assiaciated Press TV) ** TV OUT ALGERIA OUT **

  • Residents of Ain Amenas, Algeria, gather outside the hospital trying to get information concerning relatives wounded during the terrorist attack at the gas plant, Friday, Jan. 18, 2013. The hostage crisis in the remote desert of Algeria is not over, Britain said Friday, after an Algerian raid on the gas plant to wipe out Islamist militants and free their captives from at least 10 countries unleashed bloody chaos. (AP Photo/Anis Belghoul)

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