An overpass in Mexico City”s metro collapsed on Monday night, killing at least 20 people and injuring about 70, city authorities said.
Mayor Claudia Sheinbaum said 49 of the injured were hospitalised, and that seven were in serious condition and undergoing surgery.
“There are unfortunately children among the dead,” Sheinbaum said, without specifying how many.
The mayor said a motorist had been pulled alive from a car that was trapped on the roadway below.
A crane was working to hold up one subway car left dangling on the collapsed section so that emergency workers could enter to check the car to see if anyone was still trapped.
Dozens of rescuers continued searching through the wreckage from the collapsed, preformed concrete structure.
The overpass was about 5 metres above the road in the southside borough of Tlahuac, but the train ran above a concrete median strip, which apparently lessened the casualties among motorists on the roadway below.
Rescue efforts were briefly interrupted at midnight because the partially dangling train was “very weak.”
“We don’t know if they are alive,” Sheinbaum said of the people possibly trapped inside the subway car.
Hundreds of police officers and firefighters cordoned off the scene as desperate friends and relatives of people believed to be on the trains gathered outside the security perimeter.
The accident happened on the metro’s Line 12, the construction of which has been plagued by complaints and accusations of irregularities.
The Mexico City Metro, one of the largest and busiest in the world, has had at least two serious accidents since its inauguration half a century ago.
In March of last year, a collision between two trains at the Tacubaya station left one passenger dead, injuring 41 people. In 2015, a train that did not stop on time crashed into another at the Oceania station, injuring 12 people.