essex police
It is now believed that all 39 people who died were Vietnamese nationals.
A 40-year-old man has been arrested on suspicion of murder.
Police said they have identified families for some of the victims.
39 people lost their lives in the tragedy.
Essex Police are searching for Ronan and Christopher Hughes.
He will next appear at the Old Bailey on November 25.
A man and woman from Warrington, and another man from Northern Ireland, have been bailed.
The 25-year-old from Northern Ireland was arrested in the early hours of Wednesday.
Gardai said the man was being held over an unrelated outstanding court order.
Police said they were hoping to arrest those involved 'as soon as possible'.