Overview

• The fire was reported around 4:15 a.m. on the 2500 block of Chestnut Street, according to officials.
• The blaze involves a three-story residential building under construction with heavy fire on the second floor and spread to an adjacent building.
• Two San Francisco firefighters were injured during operations and taken to a hospital, and their conditions were not immediately known.
• Chief Dean Crispen said roughly 145 firefighters responded as crews continued an interior attack on the blaze.
• Officials advised avoiding Chestnut Street between Baker and Broderick as the response continues and the cause has not been released.