Immigration officers swooped on a north Warwickshire industrial estate (UK) last night and arrested about 50 suspected illegal immigrants.
A spokeswoman for the Immigration Service said some of the suspects were from Ghana, Jamaica, Tanzania, Burundi.
The arrests were made at Hams Hall, near Coleshill, at 9pm.
The Immigration Service confirmed nine people had been detained with another 30 to 40 waiting to be interviewed.
She also confirmed two people were working in breach of their visa, three had outstayed their visa, three were illegal immigrants and one was a failed asylum seeker.