Authorities in Houston said a school employee was seriously injured when a former student shot him on Friday.

In a media briefing, Police Chief Troy Finner said the shooting happened at YES Prep Southwest Secondary at approximately 11:45 a.m.

Chief Finner said the 25-year-old suspect shot through a locked glass door then shot the unnamed employee in the back.

The employee was sent to the hospital in serious condition, Chief Finner said.

No students were injured.

Police have not released a motive and are investigating whether the suspect and the employee had any past interactions.

According to the Associated Press, the suspect turned himself into police.