Three people were injured by gunfire Tuesday in a shooting on the North Harris campus of Lone Star College in Houston.

The shooting occurred outdoors in the college’s center courtyard at approximately 1 p.m. Students were warned to evacuate or take shelter.

The shooter was identified as 22-year-old Terry Foster, reports KHOU. Foster, accompanied by his friend, 22-year-old Carlton Berry, got into an argument with a man named Jody Neal. A half-hour later, Foster confronted Neal again, this time with gunfire.

Neal and Berry were wounded. Bobby Cliburn, a maintenance man, was caught in the crossfire. A fourth person was hospitalized due to a medical condition agitated by the shooting.

Foster has been charged with aggravated assault but has not been detained.

Berry was originally identified as a shooter on Tuesday.  He remains charged with aggravated assault and is still hospitalized due to wounds he received during the gunfire, according to a CBS News report.

Campus reopened late afternoon Tuesday.

Jimmy Ellison, ACU police chief, used to work in Beaumont, one hour from Houston. He said the recent rash of shootings is horrific and sad.

“It can happen anywhere, anytime. Always be alert, think through things in your mind about what you would do, where you would go, where to hide,” Ellison said. “When things happen, if you’ve already thought through that situation beforehand, you’ll be that much more mentally prepared to deal with it when it happens.”

Ben Clardy, sophomore history and English major from Houston, lives within 10 minutes of Lone Star College.

“My best friend’s girlfriend at home goes to Lone Star. The first thing that I did when I heard about it was make sure that she hadn’t been there at the time,” Clardy said. “It’ll be a really big tragedy in the community, really difficult to come back from.”