Police have arrested 13 men, all thought to be Middle Eastern, on suspicion of illegally entering the UK after an operation in Pinchbeck.
It happened in Apple Way shortly before 3pm on Sunday when police arrested the group, aged between 15 and 34 and all believed to be from either Iran or Iraq.
Eleven men were held in police custody to be handed on to Home Office Immigration Enforcement officers for interview, while two youngsters were passed on to social services for further investigation.
A Home Office spokesman said: “Our immigration enforcement teams work closely with the police and other agencies to tackle the criminal gangs that try to smuggle migrants into Britain.
“We also continue to strengthen border security to stop illegal migrants entering the UK in the first place and last year, we foiled nearly 40,000 attempts to cross the English Channel illegally.
“The Immigration Act of 2014 made it harder for people to live in the UK illegally and last year, nearly 36,000 immigration offenders were removed from the UK.
“If someone is found to have no legal right to remain in the UK, we will take action to remove them.”