At least 10 people were killed and 40 injured Monday morning after a train plowed through a double-decker bus outside Mexico City, authorities confirmed.

Surveillance footage shows the bus creeping forward through heavy traffic before attempting to cross the tracks. As it entered the crossing, the train slammed into the passenger side, cutting the vehicle in two and dragging the front half down the rails.

Emergency crews rushed to the scene, working to rescue survivors and recover victims from the mangled wreckage. The force of the collision left the bus unrecognizable, with debris scattered across the tracks.

Officials are investigating the circumstances surrounding the crash, including whether the crossing had sufficient safety signals or barriers. The tragedy has raised urgent questions about infrastructure and traffic safety in the State of Mexico.