Four immigrants face being deported following a raid at a car wash in Baxenden.
UK Borders Agency (UKBA) officials raided Baxenden Autowash on Manchester Road at around 5pm on Friday, March 23.
Five people were detained, two on suspicion of overstaying their visas, two on suspicion of working in breach of their visas and one thought to be a failed asylum seeker.
UKBA said four have been detained pending their removal from the UK.
Amar Mahmood, the manager of the car wash, said he hadn't employed anyone illegally.
He said: "It baffles me. Why would I employ anyone who hasn't got a working visa.
"There are two students who have right to work here and three people with British passports."
A UKBA spokesperson said: "UKBA conducted an enforcement operation at Baxenden Autowash on Friday.
"Five immigration offenders were identified, two had overstayed their visas, two were found working in breach of their visas and one was a failed asylum seeker. "Four have been detained pending their removal from the UK."