At least 60 people have been killed in a train crash in eastern India. According to official reports, another 120 were injured when a speeding passenger express hit a train stopped at a station in Sainthia, West Bengal, in the early hours of Monday morning.

The impact was so severe that the roof of one of the train’s coaches dislodged and went flying over the footbridge above the tracks. TV footage showed residents climbing through the mangled wreckage in search of survivors in the wake of the smash.

Emergency workers have since arrived with tools to help trapped passengers, but the cause of the crash is still unknown. The incident happened at around 2:00 local time, in the town about 200kms north of Calcutta.

Emergency workers have said that all surviving passengers caught in the wreckage have been rescued and taken to hospital. Officials believe the trains were mainly transporting workers home who had spent the weekend with their families.

A police investigation is underway to discover what caused the crash, although speculation about faulty signalling is rife. The incident marks the second major railway crash in the region this year. In May, a goods train hit a derailed Bombay-bound passenger train, killing 150 people.