Gunfire broke out in the stands at a high school basketball game in Dallas on Saturday night, leaving an 18-year-old spectator in critical condition, a police officer wounded and the unidentified shooter on the run, authorities said.

At least four shots rang out during the third quarter of a game between South Oak Cliff and Kimball high schools, prompting players and coaches to duck for cover and fans to race for the exits, video of the incident showed.

An 18-year-old victim, believed to be a former student at South Oak Cliff, was hit in the chest by a bullet and taken to a hospital, where he was in serious condition, police said.

A Dallas Independent School District police officer was grazed by a bullet when she attempted to confront the gunman, Robyn Harris, a spokeswoman for the Dallas Independent School District, said at a news conference.