At least 15 people have been killed and dozens injured after a subway overpass collapsed in Mexico City while a train was travelling on it, officials say, BBC News reported.

Several subway carriages plunged to the ground, crushing at least one car, which was on a busy road underneath.

Rescue workers and firefighters are continuing their search for survivors after the accident late on Monday.

Dramatic footage has emerged showing the overpass collapsing at the Olivos station on the metro's 12 Line.

There are fears that the death toll could rise further.