SAN FRANCISCO (KPIX 5) — A boy suffered life-threatening injuries after falling from a Muni bus in San Francisco Thursday, police said.

The 13-year-old boy fell, or was bumped from the crowded bus and hit his head on the curb near Powell and Lombard streets around 4:30 p.m., although police don’t believe he was intentionally pushed.

Paramedics performed CPR on the teen, and transported him to California Pacific Medical Center.