At least 20 people have been killed and dozens injured after a metro overpass collapsed in Mexico City while a train was travelling on it, officials say, writes BBC.

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

Rescue workers and firefighters are searching for survivors after the accident in the capital late on Monday.

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

Mexico City Mayor Claudia Sheinbaum said 20 people were confirmed dead, after she arrived at the crash site to co-ordinate the search and rescue operation.

About 70 people were injured, local emergency services said.