MEXICO CITY (AP) — Officials say an elevated section of Mexico City’s metro collapsed and at least 23 people have been killed. Mayor Claudia Sheinbaum said four bodies were still inside the train, which plunged toward a busy boulevard late Monday. It was one of the deadliest episodes in the history of the city’s subway system, which is among the busiest in the world. One subway car left was dangling with the bodies inside, and a crane was brought in to lower the car to ground level. Officials say 77 people were hospitalized. Sheinbaum said one of the concrete beams collapsed as a subway train passed over it.