A 17-year-old boy suffered life-threatening injuries when he was shot Friday in the Bayview district, police said.

The victim was sitting on a porch in the 1400 block of Shafter Street around 3:45 p.m. when two men in their 20s opened fire, cops said. The victim ran into the house and called 911.

Police believe the shooting may be gang-related, they said. No arrests have been made.

rnagle@sfexaminer.com