ANAHEIM HILLS – A fast-moving brush fire scorched 150 acres of parched hillside Sunday about a half-mile from a housing development but did not threaten any buildings, Orange County fire officials said.

The unincorporated area where the fire burned is bounded by Anaheim Hills and the city of Orange.

“It is close but there is no immediate threat to homes,” said Steven Miller, spokesman for the Orange County Fire Authority. “It is headed toward some homes. There is no order to evacuate at this point.”

He said winds blowing up to 35 mph are making firefighting difficult for the more than 30 fire units on the scene. There were 30 more firefighting units on the way, along with firefighting aircraft Sunday morning.

“Right now it's a crapshoot,” Miller said. “I think we are looking good but with the winds blowing, it really depends on direction, the fuel (of the fire). Our goal is to protect homes. I feel confident we are going to be able to do that.”

He said the homes in the area, near Santiago Oaks Regional Park, were constructed with noncombustible roofs.

The area, like much of Southern California, is under a red flag alert, indicating a high fire danger, according to Lynnette Round, an Orange County Fire Authority spokeswoman. A prolonged drought has left the chaparral-covered hills highly combustible.

Round said the blaze, which ignited at around 8 a.m., may have been started by a vehicle fire on the southbound 241 Windy Ridge Toll Plaza.