Mayor Claudia Scheinbaum said 34 of the injured had been hospitalized and people were still trapped in the train, which was split in two and stopped.
The video shows a car trapped under the rubble, with dozens of rescuers searching for the remains of the collapsed structure. The overpass was about 5 meters above the road in southern Mexico City.
“The support beam receded,” Scheinbaum said, adding that the beam collapsed just as the train passed over it.
Rescue efforts were suspended for a short time at midnight, as the partially suspended train was “very weak”
“We don’t know if they’re alive,” Scheinbaum said of people trapped in the subway.
It is unclear whether most of the dead were in subway cars or were pedestrians or drivers caught below.
Hundreds of police and firefighters cordoned off the scene in the southern district of Tlauac as desperate friends and relatives of people believed to be on trains gathered outside the security perimeter.
Oscar Lopez, 26, is looking for his girlfriend Adriana Salas, 26. Pregnant in her sixth month, she was riding the subway and returning from work as a dentist when her phone stopped answering when the accident happened.
“We lost contact with her at 10:50 p.m. There was literally no more contact,” Lopez said.
The collapse occurred on the newest of Mexico City’s subway lines, line 12, which stretches far into the southern part of the city. Like many of the city’s dozens of subway lines, it runs underground through the more central areas of the city of 9 million, but then moves on raised, pre-formed concrete structures on the outskirts of the city.
The collapse could be a major blow to Mexican Foreign Minister Marcelo Ebrard, who served as Mexico’s mayor from 2006 to 2012, when Line 12 was built. Questions about the quality of construction arose soon after he left office.
Ebrard wrote on his Twitter account: “What happened today on the subway is a terrible tragedy.”
“Of course, the causes must be investigated and the perpetrators identified,” he wrote. “I reiterate that I am entirely at the disposal of the authorities to contribute in any way.”
The subway in Mexico City, one of the largest and busiest in the world, has suffered at least two severe accidents since its discovery half a century ago.
In March last year, a collision between two trains at Takubaya station killed one passenger, injuring 41 people. In 2015, a train that did not stop in time crashed into another at Oceania station, injuring 12 people.
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