Authorities have found some 68 migrants crammed in a shipping container at a port northeast of London.

East of England Ambulance Service was called at 10 p.m. Thursday amid reports of people being locked in a container at Harwich International Port in Essex.

The service says the migrants were feeling faint and were suffering from abdominal and chest pains. Seven people, including two pregnant women, were taken to the hospital.

The service said in a statement Friday that the remaining migrants were turned over to U.K. border authorities.