(KRON) — Firefighters are responding to a brush fire near Highway 4 in the Martinez area, according to the Crockett Carquinez Fire Department. The fire is burning adjacent to westbound Highway 4, east of McEwen.

Firefighters are reportedly calling for a second alarm. The fire has burned five acres, but forward progress has apparently been stopped. “Crews will be mopping up for an extended period,” Crockett Carquinez FD tweeted.

This is a developing story. Check back for updates.