Families in Vietnam are waiting to find out if their loved ones were among the 39 people found dead in a truck trailer in England.
A police investigation continues following the opening of a trailer in Grace, Essex, last Wednesday.
Maurice Robinson, 25, is accused of killing 31
He is also charged with crimes of human trafficking, immigration and money laundering, Essex police said.
Mr Robinson, of Laurel Drive, Craigavon, Northern Ireland, is arraigned before the Chelmsford Magistrates Court on Monday.
In Vietnam, the relatives of Bui Nunghung, 19, expressed fears that he might be among the dead.
The teenager is believed to be the youngest of those killed.
Since the bodies were discovered on Wednesday, several families in Vietnam have raised concerns about missing relatives.
Among them are 26-year-old Pham Trai Mo, who last sent a message to his family on Tuesday, and two men – Nguyen Din Luong, 20, and Nguyen Dinh Tu.
VietHome representative – Vietnamese website in the UK – said he handed over the photos to nearly 20 people who were reported missing by detectives.
Police said they were investigating a "broader plot" after reports that the truck may have been part of a convoy of three carrying about 100 people.
Four other men were held by officers.
Three of them – a man and a woman, both 38, from Warrington, Cheshire and a 48-year-old man from Northern Ireland – remain in police custody.
All three were arrested on suspicion of murder and conspiracy to commit trafficking.
A 20-year-old man arrested by Dublin police in Dublin is said to be of "interest" in the Essex police investigation.
- Why did the Vietnamese try to get to the UK?  Truck Deaths in Essex: What We Know
The victims – initially believed to be Chinese by police – were in the trailer of a truck coming to Britain via the Belgian port of Zeebrugge.
The victims carried "very few" IDs, leaving employees to rely on fingerprints, DNA and features such as tattoos or scars, police said.
Meanwhile, concerns have been raised about the UK's ability to work with European anti-trafficking officials after Brexit.
Yvet Cooper of Labour and Conservative exile Dominic Grieve expressed fears of co-operation with Europol as plans for a post-Brexit transition and thereafter has not yet been agreed.
But the Home Office said the UK would continue to work with EU law enforcement agencies with or without a Brexit deal.
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