Detectives investigating the deaths of 39 people whose bodies were found in a lorry in Essex have named two suspects they want to speak to on suspicion of manslaughter and human trafficking.
Ronan Hughes, 40, and his brother Christopher, 34, both from Armagh are being sought by Essex Police.
Lorry driver Mo Robinson was charged with the manslaughter of 39 persons unknown, conspiracy to traffic people between December 1 2018 and October 24 2019 and conspiracy to assist unlawful immigration between the same dates.
He was further charged with one count of acquiring criminal property and one count of concealing criminal property, both between December 1 2018 and October 24 2019.
Another man wanted in connection with the investigation was arrested at Dublin port on Saturday.
Gardai said the man, who is in his early 20s and from Northern Ireland, was held over an unrelated outstanding court order.
He is understood to be sought by Essex Police as part of their probe, and the force confirmed officers are in touch with Irish police.
Three other suspects have been released on bail.
A man and woman, both 38, from Warrington were arrested in Cheshire on Friday and a 46-year-old man from Northern Ireland was arrested at Stansted Airport later the same day.
All three had been questioned on suspicion of manslaughter and conspiracy to traffic people.
The man and woman from Warrington were released on bail until November 11 while the Northern Ireland man has been bailed until November 13, police said.
It is not yet known when the victims entered the trailer, where temperatures can be as low as minus 25C if the fridge is activated, or the exact route it travelled.
Belgian officials said the trailer arrived at Zeebrugge at 2.49pm on Tuesday and left the port the same day en route to Purfleet.
The trailer arrived at Purfleet at around 12.30am on Wednesday, and was picked up by the cab, known as the tractor, which arrived from Northern Ireland via Holyhead in North Wales on Sunday.
The lorry left the port at Purfleet shortly after 1.05am before police were called to the Waterglade Industrial Park on Eastern Avenue in Grays at 1.40am.
Essex Police initially believed the 39 were all Chinese nationals, but Vietnamese men and women are now feared to be among the dead and other nationalities may be involved.
All of the bodies have now been moved from the truck in Tilbury Docks to Broomfield Hospital in Chelmsford, for post-mortem examinations to be carried out.
It is understood that very few had identification documents, forcing investigations to rely on features such as fingerprints, scars and tattoos to try and trace their families.