POLICE have raided a suspected fuel laundering plant in County Tyrone, in an operation linked to the investigation into the death of a man in a container in Tilbury.
The dead man was one of 35 people from Afghanistan, including 15 children, found at Tilbury Docks on 16 August.
Three people have now been arrested on suspicion of manslaughter.
In follow-up searches, police have found a suspected fuel laundering plant and 1350 litres of fuel in Coalisland, Northern Ireland.
The facility, which was said to have been capable of producing 1000 of illicit fuel per day, has been dismantled.
Police said a 47-year-old man from Dungannon, County Tyrone, was arrested earlier at Liverpool Ferry Port by port police.
He is due to be transferred into the custody of Essex Police.
Two other men also charged in connection with the death remain in custody to appear at Basildon Crown Court in November.
A 34-year-old from Rose Park, Limavady, Londonderry and another aged 33, of, Elmgrove, Londonderry are both charged with conspiring to facilitate illegal entry into the UK.
