Sixteen people found stowed away in a lorry at Perkins Engines in Peterborough are being questioned by police.
They were found yesterday morning and are thought to be from Eritrea in Africa.
The Home Office says the ten men and six women in the lorry had entered the country illegally.
They were taken to Thorpe Wood police station.
Almost 300 drivers have been caught breaking the law, in the first joint police operation targeting the whole of the M5 motorway.
A man who smashed into the back of a family car on the M6 motorway, killing an 11 day old baby, has been jailed.
Woman travelling in car boot sparks kidnap scare