Two more people have been arrested after 39 bodies were found in a truck container in Essex, 20 miles east of London, on Wednesday.
Police arrested a 38-year-old man and a 38-year-old woman on suspicion of conspiracy to traffic people and on suspicion of 39 counts of manslaughter, authorities said in a statement.
This is in addition to the 25-year-old truck driver from Northern Ireland whom police arrested on Wednesday on suspicion of murder.
On Thursday, police announced that they had secured a warrant to hold the man in police custody for a further 24 hours.
Post mortem examinations of the bodies also began Friday, police said.
