A cluster of brush fires erupted along the fringes of suburban neighborhoods in eastern Los Angeles County on Tuesday.
Helicopters and SuperScooper airplanes roared low over homes to drop loads of water on the flames in hilly terrain just outside back yards. Lines of widely separated flame moved across rolling grasslands.
Weather appeared to be on firefighters' side, with little wind evident.
County Fire Inspector Steve Zermeno said reports of five to eight separate fires near State Route 60 came in about 11:45. The area is about 25 miles east of downtown Los Angeles.
About 150 firefighters were called in. County firefighters were being aided by local city departments.
Diamond Bar is a modern community, incorporated in 1989, with a population of about 58,000 spread over 15 square miles.