SAN FRANCISCO—An unidentified truck driver was transported to San Francisco General Hospital with life-threatening injuries following a five-car pileup on December 13.

At around 4:20 p.m., the driver of the semi truck collided with another vehicle, subsequently hitting three parked cars and a building on 21st and Guerrero Streets.

A second person was injured in the crash. Police are currently investigating the cause of the wreck.