BIG BEAR LAKE (AP) — Schools have reopened in the Southern California mountain community where crews are battling a small forest fire burning through timber near a popular ski resort.

Firefighters have held the blaze at Big Bear Lake in the San Bernardino Mountains to 100 acres. It is 50 percent contained.

READ MORE: USC Alerts Staff To Alleged Sexual Assaults At Sigma Nu Fraternity House

Classes resumed Wednesday for all schools within Bear Valley Unified School District. The schools were closed Monday and Tuesday because of poor air quality.

READ MORE: Long Beach Man Killed In Fatal Collision

The blaze broke out Sunday in the area about 100 miles east of downtown Los Angeles. The cause is under investigation.

MORE NEWS: Prop Gun Misfire On Set Of 'Rust,' Starring Alec Baldwin, Kills 1 Person, Wounds Another

(Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)