Families in Vietnam are waiting to find out if their loved ones were among 39 people found dead inside a lorry trailer in England.
The police investigation continues, following the discovery of the trailer in Grays, Essex, last Wednesday.
Maurice Robinson, 25, has been charged with the manslaughter of 31 men and eight women.
He has also been charged with people trafficking, immigration and money laundering offences, Essex Police said.
Mr Robinson, of Laurel Drive, Craigavon, Northern Ireland, is due before Chelmsford Magistrates Court on Monday.
In Vietnam, relatives of Bui Thi Nhung, 19, expressed fears she may be among the dead.
The teenager is thought to be the youngest of those who died.
Since the bodies were discovered on Wednesday, several families in Vietnam have expressed concerns over missing relatives.
Among them are Pham Thi Tra My, 26, who last messaged her family late on Tuesday, and two men – Nguyen Dinh Luong, 20, and Nguyen Dinh Tu.
A representative of VietHome – a website for Vietnamese people in the UK – said it had passed on the pictures of almost 20 people who have been reported missing to detectives.
Police said they were investigating a “wider conspiracy” after reports that the lorry may have been part of a convoy of three carrying around 100 people.
Another four people have been held by officers.