Raids have taken place across England in an operation to tackle people smuggling involving suspected Kurdish gangsters.
The National Crime Agency (NCA) said 350 officers were involved in the raids in the Northumbria, Cleveland, Sussex and Metropolitan Police force areas.
It said a number of arrests had been made at about 20 addresses.
The gang is suspected of charging up to £10,000 per head to smuggle migrants across the Channel.
As well as residential properties, a number of car washes believed to be linked to money laundering activities were also raided.
So far more than 20 arrests have been made, with the majority being held on Teesside.
The operation followed a year-long investigation with links to the French, Belgian and Dutch authorities, the NCA said.
Officers at a briefing at Cleveland Police’s HQ in Middlesbrough were told some of those targeted were suspected of being involved in bringing migrants into the UK in lorries for money.
They were told two men in the Linthorpe area of Middlesbrough were thought to be ringleaders.