A man wanted by Essex Police as part of the investigation into the 39 lorry trailer deaths has been arrested at Dublin port.
Gardai said the man, who is in his early 20s and from , was held over an unrelated outstanding court order and will appear in court on afternoon.
He is understood to be sought by as part of their investigation into the deaths of eight women and 31 men found in the refrigerated trailer in an industrial park in Grays in the early hours of Wednesday.
Four other people arrested over the deaths, including a 48-year-old man from Northern Ireland who was detained at Stansted Airport on Friday on suspicion of conspiracy to traffic people and manslaughter, .
Officers had earlier arrested a couple, named locally as haulage boss Thomas Maher and his wife Joanna, both 38, of Warrington, on suspicion of 39 counts of manslaughter and people trafficking.
Mo Robinson, 25, from , the driver of the Scania truck was arrested on suspicion of murder on Wednesday.
In Belgium, police are hunting the driver who delivered the trailer to , the port it left before arriving in the UK.
It comes after the Vietnamese ambassador to the UK met with detectives as they work to identify the bodies.
Essex Police initially believed the victims were nationals.
Detective Chief Inspector Martin Pasmore told reporters on Saturday the nationality of the victims is not yet known, but the focus is now on the Vietnamese community - although "there may be other nationalities involved".
He said he had met with the Vietnamese ambassador Tran Ngoc An in Essex and will share fingerprints in a bid to identify the dead.
All of the bodies have now been moved from the truck in Tilbury Docks to l in Chelmsford, for post-mortem examinations to be carried out.
