Of the 39, eight were women, while the remaining 31 were men. They had been found dead in a truck container, on Wednesday, at an industrial park in Grays, a town 40 kilometers east of London.

The driver of the vehicle, a 25-year-old man from the Northern Ireland has been arrested on suspicion of attempted murder, though he has not been charged yet, the report said. Detectives have been granted another 24 hours to question the man, whose name has so far not been released.

As the investigation continues, the police in Northern Ireland have conducted searches at three properties.