SAN RAFAEL (CBS SF) – Firefighters say a grass fire that damaged three properties and threatened several homes in Marin on Friday was likely arson.

The fire that was reported around 12:15 p.m. damaged an exterior wall of one mobile home in the Contempo Marin Mobile Home Park on Yosemite Road and damaged a fence and deck of two other mobile homes, San Rafael Fire Chief Chris Gray said. A female resident received a minor injury, San Rafael Fire Chief Chris Gray said.

There was a partial evacuation of about 50 mobile homes. None of the residents were displaced, Gray said.

The 5-acre blaze grew to 16 acres as winds pushed the flames around. Some of the 125 firefighters who responded were stationed near homes on top of the hill and others attacked the fire at the mobile home park below, Gray said.

Investigators say other fires breaking out around the same time lead them to believe arson may have been involved.