BIG BEAR LAKE, Calif. (AP) — Crews are contending with another day of oppressive heat as they try to beat back a 1,200-acre wildfire in the San Bernardino Mountains east of Los Angeles.

The blaze is only 10 percent contained Wednesday and some 500 firefighters are on the line, aided by a fleet of water- and fire retardant-dropping aircraft.

Mandatory evacuation orders were lifted Tuesday afternoon for three rural streets near Baldwin Lake.

Two firefighters were treated for heat-related injuries after the blaze erupted Monday.

The fire is burning in tinder-dry brush and it gained strength as temperatures soared to near 90.