An overpass carrying a subway train collapsed in Mexico City late Monday, killing 20 people including children according to local government officials.

The train was traveling on an elevated part of the city’s rapid transit system on the newest Line 12, also known as the Golden Line, when part of the overpass collapsed onto traffic below, Mexico’s Secretariat of Risk Management and Civil Protection said.

CCTV surveillance footage shows the moment the overpass collapsed directly onto the street, sending up a cloud of dust and debris. Earlier, officials said at least 70 people were injured.

The incident happened at 10:25 p.m. local time, according to Mexico City’s Interior Minister Alfonso Suarez Del Real. Mexico City’s Mayor, Claudia Sheinbaum twitted that, ‘Firefighters, public safety personnel are working. Various hospitals are serving. We will give more information shortly.’

One survivor was trapped in a vehicle beneath the rubble, but has since been freed. There are no other people trapped, later she added.

Rescue efforts were temporarily suspended earlier in the night due to concerns over the stability of the subway car, which was still dangling over the road.