CONCORD (CBS SF) — A two-alarm grass fire burning Saturday evening near the former Concord Naval Weapons Station is now 75 percent contained, fire officials said.

The fire burning along Highway 4 in the area of East Olivera and Willow Pass Roads was first reported by the Contra Costa County Fire Protection District at about 5 p.m. As of 5:40 p.m., it had burned about 20 acres

The area is surrounded by residential neighborhoods on three sides, and as of 5:40 p.m., there were no reports of damages to structures or of injuries.

As of 6:40 p.m., forward progress of the fire had been stopped. The area burned had grown to 136 acres.

Military Ocean Terminal Concord Fire Department (MOTCO) and Cal Fire were working the fire.

At 8:23 p.m., Cal Fire reported that the fire was at 75 percent containment.

© Copyright 2020 CBS Broadcasting Inc. and Bay City News. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed