An overpass in Mexico City's metro collapsed Monday night, sending a train downward, trapping cars under rubble and injuring at least 50 people, authorities said. Of the injured, 34 were taken to several nearby hospitals for treatment.
Mexico City's civil protection agency says about 70 people were injured.
Mayor Claudia Sheinbaum, who had traveled to the scene, wrote on Twitter that "firefighters, public safety personnel are working".
How did the accident happen?
"A support beam gave way", Sheinbaum explained, adding that the beam collapsed just as the train passed over it.
The incident unfolded about 10.30pm local time.
Because the partially dangling train was "very weak", rescue efforts were briefly paused at midnight and a crane had to be brought in. People were still trapped inside, but it was not clear if they were alive.
Video showed a auto trapped under rubble, with dozens of rescuers searching through wreckage of the collapse structure.
Photos and videos from the scene show the train hanging from the collapsed overpass and various cars buried underneath. The tweet said that there were still people trapped inside the carriages. Its construction was plagued by complaints and accusations of irregularities.
Ebrard wrote in his Twitter account: "What happened today on the Metro is a awful tragedy".
'Of course, the causes must be investigated and responsibilities defined. "I reiterate I am at the disposal of authorities to help in whatever is necessary". This was the second major accident for the system this year.
The latest accident comes at a time when Mexico is struggling to cope with the coronavirus pandemic, which has left more than 217,000 people dead in the country - one of the world's highest tolls.