An overpass in Mexico City's metro collapsed on Monday night, sending a train plunging downward onto a road, killing at least 13 people authorities said. Video showed at least one broken train along with dozens of rescuers searching through the rubble of the collapsed overpass. Several cars are believed to be trapped under rubble. 70 people injured in the accident were being taken to nearby hospitals. “A support beam gave way,” said Mexico City Mayor Claudia Sheinbaum, who had rushed to the scene of the accident. The accident happened on the metro's Line 12, the construction of which has been plagued by complaints and accusations of irregularities. Mexican foreign minister Marcelo Ebrard described the accident as a ‘terrible tragedy’