Four people were killed and 23 injured when a passenger train slammed into the buffers at a station north of Cairo, the Egyptian health ministry said in an update Wednesday. The train went off its tracks as it traveled through the station in the city of Qalyub on its way to the city of Menouf in the Nile Delta, state prosecutors said in a statement. They said they had opened an investigation into the cause of the crash. The National Railways Authority said the driver had overshot the station and run into the buffers at the end of the track after passing through a stop signal. "That led to the derailment of the locomotive and the first carriage," the authority said in a statement. Photos from the scene showed emergency crews using a crane to lift the derailed coach that appeared to be partially crumpled.