Three people who were held in connection with the 39 lorry deaths in Essex were today released on bail.
The 38-year-old man and a 38-year-old woman from Warrington had been arrested on Friday, while a 46-year-old man from Northern Ireland was held at Stansted Airport later the same day.
All three had been questioned on suspicion of manslaughter and conspiracy to traffic people.
Essex Police said the man and woman from Warrington have been bailed until November 11, while the man from Northern Ireland was bailed until November 13.
Their collective releases come after Maurice Robinson, 25, was charged with 39 counts of manslaughter, conspiracy to traffic people, conspiracy to assist unlawful immigration and money laundering on Saturday. He is due to appear at Chelmsford Magistrates' Court on Monday.
A fifth man was also arrested at Dublin Airport on Saturday.
Meanwhile, police in Vietnam have taken DNA samples from relatives of people feared to be among the 39 found dead in the lorry.
Essex Police has been trying to identify the bodies, which were discovered on Wednesday in a container on an industrial estate in Grays.
Initially, officers believed the victims were Chinese, but a number of Vietnamese families have since come forward saying they have not heard from their relatives.
The force said very few of the victims were carrying official identification and that it hopes to identify them through fingerprints, dental records and DNA, as well as photos from friends and relatives.
And the fathers of Joseph Nguyen Dinh Luong and Pham Thi Tra My, believed by their families to have died in the lorry, said Vietnamese police had visited them to collect hair and blood samples.
"Police from the Public Security Ministry came to get DNA samples, our hair and blood," Nguyen Dinh Gia told Reuters in the Ha Tinh province.
Meanwhile, Pham Van Thin, Ms Tra My's father, told Sky News on Sunday: "We tried to talk her out of it because it would be a very difficult journey for her as a girl.
"But she said: 'If I don't go, the family would stay in a very difficult situation because of the big debt.' So she took a risk and decided to go, and we had to agree."
He added: "We all have been in shock. I cannot explain our pain and devastating feeling. We were all very devastated and sad."
