#ULTIMAHORAAsí el colapso en el #MetroCDMX en la estación Olivos de la Línea 12 cuando pasaba el tren, en Tláhuac.https://t.co/1aNtU3N8P8 pic.twitter.com/0bSmBDGu4Q
— @diario24horas (@diario24horas) May 4, 2021
PRECAUCIÓN: Ambulancias y bomberos en camino por accidente en la estación del metro Olivos, línea 12. ⚠️ pic.twitter.com/UFkcB1llju
— SUUMA Voluntarios (@SUUMA_CDMX) May 4, 2021
Other images showed at least two train carriages precariously hanging from the damaged overpass as emergency fire and medical crews initially used ladders to access the carriages
However, Mexico City Mayor Claudia Sheinbaum said the rescue had been suspended "because the train is very weak."
A crane transported to the site was working to stabilize the train carriages so rescuers could resume their search to see "if there are more people inside the train car," she said.
Sheinbaum said a person trapped in their car underneath the rubble had been rescued alive and was taken to hospital. Seven of the people transported to hospital were in a "grave condition" and undergoing surgery, she said.
Sheinbaum said authorities were working to identify the people who were killed. She earlier said a total of around 70 people had been injured.
Wearing a hard hat and face mask to speak to reporters at the accident site, Sheinbaum said it appeared a girder had given way on the overpass but the cause was being investigated.
The Metro 12 line that runs over the collapsed overpass was built almost a decade ago when Foreign Minister Marcelo Ebrard was mayor of Mexico City.
"What happened today with the Metro is a terrible tragedy. My solidarity is with the victims and their families," Ebrard said on Twitter. "Of course, the causes must be investigated and responsibilities defined."
Ebrard and Sheinbaum are seen by many political observers as the most likely successors to President Andres Manuel Lopez Obrador once his six-year term is over in 2024.