Updated at 5:20 p.m. Wednesday: Revised to include reward information.

Four people, including two juveniles, were wounded Tuesday night in a shooting near a Garland elementary school, police said.

Police received multiple calls about shots being fired about 6:30 p.m. next to Northlake Elementary School at Bosque and Lavaca drives, Lt. Pedro Barineau said.

Two teens, a 13-year-old girl and a 16-year-old boy, were hospitalized. A man was grazed by a bullet and treated at the scene, he said.

As they were investigating, police learned a fourth gunshot victim, a man, was at Baylor Medical Center at Garland, Barineau said.

None of the injuries were thought to be life-threatening.

Police are investigating the shooting as a gang-related incident. They believe two groups showed up there to fight, and one group began shooting at the other, Barineau said.

Anyone with information about the shooting is asked to call Garland police at 972-485-4840. Anonymous tips may be made by calling Crime Stoppers at 972-272-8477 or by visiting www.garlandcrimestoppers.org.

A reward of up to $5,000 is being offered for information that leads to an arrest.