Immigration officials have detained 15 suspected illegal immigrants at Magna Park near Lutterworth after being tipped off by a member of the public.
A Leicestershire Police spokesman said that officers had been called to the huge warehousing and logistic centre between Bitteswell and Lutterworth after a member of the public spotted people acting suspiciously near the back of a lorry.
A total of 15 people were eventually arrested, including three family groups and four single adults.
It happened in the early evening last Tuesday.
Police officers made the arrests and then passed the case on to immigration officials.
Neither the police nor the Home Office were willing to explain what the suspicious activity was.
A Home Office spokesperson told the Mail: “When suspected illegal immigrants found on lorries are arrested by police we respond quickly.
“We work closely with police to tackle illegal immigration.
“Where someone is found to have no legal right to remain in the UK we will take action to remove them.”
Four of the adults are now in an immigration detention centre and the families have been bailed, all pending consideration of their immigration applications.
The story came to light after a police officer sent a message out on social media network Twitter last Tuesday night at about 6pm.
Crime and Operations Sergeant for the Lutterworth and Broughton Astley area Paul Hardwick tweeted: “Please report any suspicious behaviour near HGVs after 17 illegal immigrants found near Lutterworth.”
This figure of 17 was corrected by the Home Office to 15 on Monday.
Sgt Hardwick added that their welfare had been checked being before handed over to immigration officials.
Nick Brown, a spokesman for Gazeley Properties which owns Magna Park, said its security team was made aware of the incident and they assisted police.