Police arrested 10 men and two women, and three males believed to be minors were taken into social services care
A group of 15 suspected illegal immigrants from the African nation of Eritrea were arrested at the M4 services near Reading.
Police arrested 10 men and two women, aged between 22 and 29, at the services on Friday, July 25,.
Four of the men and both women remain in custody pending questioning by immigration officers. The other six men have been placed on immigration bail while their cases are progressed.
Three males, believed to be minors, were taken into social services care after being age assessed.
A Home Office spokesman said: “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.”
Eritrea is located on the horn of Africa, north of Ethiopia and south west of the Red Sea, with a population of around 5.6 million.