Randal Davidson, a teacher in Dalton, Georgia, has been taken into police custody after he barricaded himself into a classroom and fired shots out of a window, the Atlanta Journal-Constitution reports.

Randal Davidson was alone in his locked classroom this morning, during a planning period, when a student tried to enter the room. When the student noticed the door was locked. The principal was alerted and unlocked the door with a key.

According to Dalton Police Department spokesman Bruce Frazier, Davidson then forcibly closed the door, and a gunshot followed.

The police were called and students were evacuated to the school’s gymnasium and locker rooms, before being transferred to Northwest Georgia Trade and Convention Center. The high school was placed on lockdown and the police warned parents to stay away from the school. They were allowed to retrieve their children from the convention center.

No one was shot, but a student sustained an ankle injury during the evacuation. After a 30-45 minute standoff, Davidson surrendered to police.

“I don't believe we've had any dealings with him before,” Frazier said. Police confirmed that Davidson used a handgun but the type is unknown.

Davidson began working at Dalton High School in 2004, and is known as the “Voice of Dalton High Football” because he gives play-by-play commentary during football games. In 2012, he was recognized as a STAR teacher by one of his students, according to the school website.

This incident comes two weeks after 17 people were killed during a mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida. Since that shooting, there have been calls to arm teachers to prevent future shootings.

Like the students in Parkland, Dalton High School students took to social media to express their feelings about the incident.