French authorities are investigating whether sabotage caused a train derailment that injured 44 people in Normandy, after a piece of rail was found on the track, police told The Associated Press on Saturday.

The train derailed between Rouen and Caen in Normandy, northwest France, on Friday evening. One of the injured was in a critical state.

The train derailed between Rouen and Caen in Normandy, northwest France, on Friday evening. France's transport minister cautioned that the casualty toll was "provisional."

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