Firefighters are battling a brush fire that grew to nearly 400 acres after starting Saturday near the 5 Freeway north of Castaic.
Two firefighters suffered burn injuries. Details about their conditions were not immediately available, but both were transported for treatment.
The fire grew to nearly 400 acres by 6:30 p.m. The 5 Freeway was temporarily closed in both directions at State Route 138 and Templin Highway.
At about 8 p.m., firefighters said an aggressive aerial and ground attack was slowing the fire. Helicopters continued drops on the flames overnight.
Details about how the fire started were not immediately available.