Firefighters spent hours Sunday morning battling a blaze in Redwood City before controlling the six-alarm conflagration that damaged an apartment building and injured 21 people.
The fire was first reported a short time before 2 a.m. at the 72-unit Hallmark House Apartments at 531 Woodside Road, Redwood City Fire Marshal James Palisi said.
Fire crews arrived on the scene to find heavy flames and smoke coming from the building and many residents standing on balconies waiting to be rescued, Palisi said.
More than 100 firefighters with 20 engines and seven ladder trucks responded to the scene, Redwood City spokesman Malcolm Smith said.
Firefighters climbed ladders and entered burning homes to rescue the trapped residents, and helped 21 people who were suffering from "minor to moderate injuries" get to local hospitals, Palisi said.
None of the injuries were considered life-threatening, Smith said.
The fire displaced approximately 97 people, Smith said. An evacuation center was set up at the Fair Oaks Community Center, located at 2600 Middlefield Road.
Woodside Road was closed in both directions for much of the day, Smith said.
The cause of the fire remains under investigation.