A man was critically injured after he was shoved in front of an oncoming train during a fight on a Muni platform Sunday night.

San Francisco Police Department spokesperson Officer Grace Gatpandan says that officers were called to Civic Center Station at 9:01 Sunday night on reports that two men were involved in a physical altercation that took an increasingly violent turn.

Witnesses said that the men were fighting on the station's Muni platform when one pushed the other into an oncoming light-rail vehicle.

A fire dispatcher who spoke with Bay City News said the man was able to pull himself off the Muni tracks, but Gatpandan says he was still left with "a serious head injury," and was transported to San Francisco General Hospital "with life threatening injuries."

His alleged pusher fled the scene, Gatpandan says, and no arrests have been made.

Most Muni station platforms are equipped with extensive surveillance systems, and though Gatpandan did not have any information on footage from the incident at publication time, it's reasonable to assume that police will be pulling video from those cameras in an effort to identify the suspect.