Three suspects arrested in Britain over the deaths of 39 people found in a refrigerated truck have been released on bail, police said Sunday.

In this Oct. 23, 2019, file photo, police forensic officers attend the scene after a truck was found to contain a large number of dead bodies, in Thurrock, South England. The discovery in England of the bodies of 39 people believed to be from China lays bare some crucial but sometimes overlooked facts about China's development as a rising global power that has elevated hundreds of millions of its citizens to the middle classes. (Photo: AP)

They are a man and woman, both 38, from Warrington in northwest England, and a 46-year-old Northern Irish man who had been held at London's Stansted Airport. 

They were arrested two days after the bodies of eight women and 31 men were discovered Wednesday in a truck in an industrial zone in Grays in Essex, southeast England.

The three suspects were questioned on suspicion of manslaughter and conspiracy to traffic people. 

Police have charged the driver of the truck, Maurice Robinson, with 39 counts of manslaughter and conspiracy to traffic people.

The 25-year-old from Northern Ireland, who also faces charges of conspiracy to assist unlawful immigration and money laundering, will appear in court on Monday.

Another Northern Irish man was also arrested in Dublin on Saturday.