At least 15 people were killed and dozens injured when an elevated metro line collapsed in the Mexican capital on Monday as a train was passing, authorities said.
Security camera footage broadcast by local media showed the carriages plunging towards the ground in the south of the city.
"So far we have 15 people who unfortunately lost their lives," Mexico City Mayor Claudia Sheinbaum told reporters, AFP reported.
The city's civil defense department said on Twitter that around 70 others were injured in the dramatic accident.
Emergency services were seen working to rescue victims from the carriages at the Olivos station.
The mayor also said on Twitter that a broken beam caused the accident on Line 12 of the metro system, which took place in the southeast side of the city.
Images broadcast on Milenio showed how the overpass collapsed and the train toppled onto automobile traffic below, amid a cloud of dust. Ambulances rushed the injured to several hospitals across the city while hundreds of fire fighters and civil defense personnel worked on trying to recover people under the rubble, TV images showed.
The overpass collapse risks hurting politically both Mayor Sheinbaum and Foreign Affairs Minister Marcelo Ebrard, two key allies of President Andres Manuel Lopez Obrador who are seen as his potential successors, Bloomberg reported.
The Metro line where the accident took place was built under Ebrard when he was mayor of Mexico’s capital, with the project suffering from long delays and design problems, while Sheinbaum has been in charge of the city for over two years now.