At least 23 people have died after an overpass in Mexico City collapsed, splitting a train in two and leaving it hanging precariously over a road.
Forty-nine people have been taken to hospital after the accident, said the city's mayor - who also gave the updated death toll.
Emergency crews and firefighters have been searching through the train for survivors and at least one car has been buried by rubble.
There were still people trapped inside the train but it was unclear if they were alive, said Mayor Claudia Sheinbaum.
She added that some minors were among those killed.
The accident happened at 10.30pm local time (4.30am UK time) on the metro's Line 12 - the construction of which has been plagued with complaints and accusations of irregularities.
The mayor said a support beam had given way as the train passed over it.