At least 20 people were killed and 70 injured when the upper part of the Mexico City subway collapsed on the lower road, leaving the train split in two and hanging precariously.
The accident, which occurred late on Monday, was reported when a car crashed into a column supporting the railway bridge. Mayor Claudia Sheinbaum, addressing local journalists with a hard hat, said a support beam had given way.
Videos shared on social media he caught the moment the line fell, falling into a crowded path below. Sheinbaum said at least one car was trapped under the train.
Where rescue workers were, they were looking for passengers who were alive or trapped. Forty-nine people were taken to hospital.
The accident happened on line 12, the newest metro line, south of the capital. The line was created when Marcelo Ebrard, now the foreign minister and Andrés Manuel López Obrador as the main contender for the presidency, became mayor of the city.
On Twitter, Ebrard promised his full support to investigate the “horrific tragedy”.
Line 12 was partially closed in 2014-15 to correct what the authorities described at the time as a structural flaw. Four stations were also closed in 2017 when a major earthquake hit the capital.
A survivor told Forum TV that the train “suddenly braked and we all felt like we were being pulled in the other direction. My cell phone flew away … I saw people who were dizzy and unconscious.”