WRIGHTWOOD, Calif. – Firefighters launched an aggressive ground and air assault Sunday against a wind-fanned wildfire that erupted in the San Gabriel Mountains and threatened a popular resort community.

Crews spent the day cutting fire lines while battling erratic winds. Helicopters and air tankers, which were briefly grounded due to the weather, dropped water and retardant on the blaze, which doubled overnight to 3,500 acres.