Crews control 5.1-acre fire near Briones Regional Park in Martinez

MARTINEZ, Calif. -- A 5.1-acre fire that broke out Monday afternoon close to Briones Regional Park in Martinez has been fully contained, Contra Costa County Fire Protection District officials said.

The fire was reported at 3:22 p.m. at Carter Acres Lane and Reliez Valley Road in Martinez and was 100 percent contained by firefighters at 4:15 p.m.

Fire Marshal Robert Marshall of the Contra Costa County Fire Protection District said the blaze left one outbuilding somewhat charred, but no structures or homes were damaged.

A couple Martinez residents with homes that could have been threatened by the fire's spread were fighting the blaze back with hoses, Marshall said

No one was injured by the fire, which Marshall expects to be extinguished within the hour. The official cause is still yet to be determined.