An elevated portion of the Mexico City metro collapsed late Monday, sending a subway car plunging into a crowded boulevard, killing at least 23 people and injuring about 70, according to city authorities. Rescuers spent hours searching for someone that could be stuck in a vehicle that had been left hanging from the overpass. However, those attempts were halted early Tuesday due to safety issues for those operating around the precariously hanging driver. A crane was brought in to assist with the stabilisation. âWe don't know if they are alive,â Mayor Claudia Sheinbaum said of the passengers who might have...