A triple shooting near Ballou High School left two teens and one adult injured. (credit: John Domen/All-News 99.1)

UPDATE: May 8, 2014 11:44 a.m. — Police have released video of the suspected gunman running from the scene.

LANHAM, Md. (WNEW) — Three people, including two teens, were shot a short distance from Ballou High School in southeast Washington Tuesday morning, police say.

The shooting occurred in the 3100 block of Martin Luther King Jr. Avenue, SE around 9 a.m., according to D.C. police. The high school was placed on lock down as police investigated the shooting. In addition, Simon and King elementary schools as well as Hart Middle School were placed on alert status.

The shooting spawned from an altercation that began on a Metro bus, according to WNEW reporter John Domen. Two 17-year-olds and a 20-year-old were shot as they exited a bus near the intersection of Martin Luther King Jr. Avenue and Alabama Avenue SE.

It is unclear whether the teens attend Ballou.

The shooting victims’ injuries are not considered life-threatening.

Police are searching for a black man with a pony tail, roughly 5 feet 6 inches tall and weighing 160 pounds. The man was wearing a black jacket at the time of the shooting.

Police Chief Cathy Lanier is expected to arrive at the scene before noon.

Mary Cuthbert, Commissioner of the Advisory Neighborhood Commission 8C, says 911 repeatedly went to voicemail when she called for 20 minutes after hearing four gunshots.