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Houston, Texas -A handcuffed Houston, Texas high school student shot himself while he was in the back of a police car on Wednesday, detectives said.

Galena Park Independent School District officials said a student took a gun to North Shore Senior High School.

School district officials said a deputy constable on campus got a report that a student at the school planned to hurt himself.

Officials said the student was found in a restroom and he appeared to be mentally unstable. It took two deputy constables to get the student out of the restroom and he was then taken into custody for his safety. An ambulance was called out to the school.

A Harris County Precinct 3 deputy constable searched, handcuffed and placed the student in the back of a patrol car, officials said.

The student had a gun concealed beneath his shirt that was not found during the search, officials said. While being driven to the ambulance, the student retrieved that gun and shot himself in the back of the head, investigators said.

The student wasrushed to Ben Taub Hospital in critical condition. School district officials said the student had surgery and was treated in the intensive care unit.

Officials said the student had been depressed since he broke up with his girlfriend in September. Counselors will be available for students and staff members who need help.