They struck Garland Independent School District officer Bruce Joiner in the ankle, officials said. Garland police officers then returned fire, fatally shooting the two men.

The facility is owned by the school district, and its officers were assisting with security.

By Sunday night, Joiner had been released from the hospital.

"Our thoughts are with him and his family," a school district statement said.

The area around the center and Naaman Forest High School remained under police security.