An active shooter situation Tuesday afternoon at San Bruno's Tanforan mall shut down the San Bruno BART station and prompted a large police response. The shooting suspect or suspects remain at large, and two teenagers were shot.

San Bruno police were warning people to avoid the area as of 4:19 p.m., and South San Francisco police were on the scene as well.

The Shops at Tanforan is a shopping center at 1150 El Camino Real.

BART shut down the nearby San Bruno station, which is about one block south of the mall on Huntington Avenue. And a follow-up report from BART (see below) suggests that a suspect or suspects may have fled on a train to Oakland's 12th Street Station.

KPIX reports via an account from a store owner in the mall that there were at least two people on the ground on the second floor of the mall, and that at least eight shots were fired. These details have not yet been confirmed by police. Ark Stein, who may be that same store owner, told KPIX in an on-air phone call that he saw one man shot in the stomach outside his store, and said that the shooter was not immediately identified, with police actively looking for the shooter outside and inside the mall.

SF General confirmed to the Guardian that they had two victims incoming to the ER with gunshot wounds.

Video from the Citizen app shows some of the police response outside the mall, and apparently SWAT members are on the scene.

The situation continues to unfold. We will update you here as we learn more.

Update: BART's 12th Street Station in Oakland was shut down with reports that the San Bruno shooter had traveled there.

Update 2: The suspects remain at large, and the BART stations were reopened Tuesday night. The Chronicle reports that one of the shooting victims is in critical condition, and the other is in serious condition.

This post has been updated throughout.