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Authorities are searching for a gunman who shot and injured a Metro train operator in East Los Angeles early Friday.

The shooting occurred about 4:10 a.m., while the L Line train was at the the Indiana Station, according to a Metro news release.

The train operator was struck twice by the gunfire. He was taken to a hospital in critical condition, according to Los Angeles County Sheriff’s Department officials, but was later said to be in stable condition, recovering at home.

“This was a brazen act of violence against a defenseless Metro operator,” the release stated.

The shooting took place from the station’s platform, according to Metro. Sky5 video over the scene shortly after 7 a.m. showed at least two evidence markers just outside the train’s open doors.

Metro Security, the Sheriff’s Department and the Los Angeles Police Department are all investigating and searching for the shooter.

Authorities have not released any further details about the incident, including a motive or a suspect description.

Officials have shut down Metro’s Indiana Station, located on Indiana Street between First and Third streets, because of the investigation. It’s unclear how long the closure will last.

Metro is urging riders who are in or traveling through the area to allow themselves extra time to get to their destination while the station is closed.

In addition to a $25,000 reward from Metro, the L.A. County Board of Supervisors are offering a $10,000 sum, for information that leads to the identification, apprehension and conviction of the shooter.

Anyone with information is asked to call Metro Security at 888-950-7233.