British police released three people on bail on Sunday after questioning them in the deaths of 39 people found hidden in a shipping container in southeastern England.

A 38-year-old man, a 38-year-old woman - both from the northern English town of Warrington- and a 46-year-old man from Northern Ireland were questioned on suspicion of manslaughter and conspiracy to traffic people.

The bodies were found early Wednesday in an industrial park in southeastern England.

Essex Police on Saturday charged the driver of the truck, 25-year-old Maurice Robinson of Northern Ireland, with 39 counts of manslaughter, conspiracy to traffic people, conspiracy to assist unlawful immigration and money laundering. He is to appear in court Monday.

Irish police said another man was arrested Saturday in connection with the case.

Up to 24 families have reported to local authorities their missing children as of Sunday afternoon, VNExpress website reported. Police said their investigation includes over 500 exhibits, including mobile phones which have to be downloaded to help identify the victims.

“We are working hard to understand how the 39 victims of this tragic incident have died and to identify all those involved,” said Detective Chief Inspector Martin Pasmore. “We remain open-minded as to nationalities of those who have died. We are asking anyone who may have information that may assist us in identification to come forward to us.”

One family received a final text from their daughter saying she couldn’t breathe and was dying. Another grieving family set up a makeshift altar for their missing daughter who paid $10,000 in hopes of pursuing a career as a nail technician in Britain. A desperate father is searching for his son, who frequently calls home but hasn’t since last week.

They are some of the dozens of families looking for any information about their loved ones following the discovery earlier this week of 39 bodies in the back of a sealed truck in southeastern England. The investigation into the gruesome case is still in the early stages, but British officials have deemed it one of the deadliest cases of people smuggling ever reported in the country.

British police charged the 25-year-old truck driver Saturday with 39 counts of manslaughter and conspiracy to traffic people. Five people are being questioned by police, including the truck driver and three people who were arrested Friday on suspicion on manslaughter and conspiracy to traffic people.

Agencies