Mandatory evacuations remain in effect in the Sierra Madre, California area Monday (4/28) as crews work to gain ground on a large brushfire burning in the northern edge of the city.

Firefighters say they lost some ground overnight. Containment has fallen from 30 percent to 23 percent because a burst of wind during the night pushed flames past some containment lines.

The fire, which broke out Saturday afternoon in a popular hiking area in the Angeles National Forest, has burned about 490 acres. About one thousand people have been evacuated.

Fire officials say they will evaluate conditions to determine how long the evacuation order will remain in effect. All schools in the Sierra Madre area are closed today.

If the weather cooperates, the fire could be fully contained in four to seven days.