100-plus acres burn in grass fire in unincorporated Brentwood

A grass fire has burned 100-plus acres in unincorporated Brentwood as of early Monday night, a fire official with the East Contra Costa Fire 
Protection District said.

The blaze was first reported at about 4 p.m. in the 7000 block of Orwood Road, fire district Fire Marshal Steve Aubert said. 

No structures are threatened and no one has been injured. The cause is under investigation.