SAN BERNARDINO (AP) — A small but fast-moving brush fire that broke out on a Southern California hillside has burned five structures and injured three people.

A spokesman for the San Bernardino County Fire Department says the fire broke out in the northern part of the city Saturday afternoon and quickly spread to about 10 acres before firefighters got a handle of the blaze.

Capt. Jeremy Kern said authorities evacuated residents in the four blocks closest to the fire.

Kern said investigators were trying to determine what kinds of structures were burned and the extent of their damage.

Two firefighters and a civilian were treated for smoke inhalation or heat exhaustion.

The cause of the fire was under investigation.