ORINDA -- About 30 to 40 homes were briefly threatened by a three-alarm brush fire in the area of Orinda Oaks Park on Monday afternoon, but crews had the blaze under control by about 3 p.m.

There were no reports of injuries or structural damage caused by the blaze, which had burned about eight to 10 acres and was reported 100 percent contained shortly after 3 p.m., according to Moraga-Orinda Fire Operations Chief Darrell Lee. Students were being evacuated by bus from nearby Orinda Intermediate School, according to Principal Michael Randall.

The blaze began at approximately 1:30 p.m. near 80 Ivy Drive, according to Contra Costa Fire Marshal Robert Marshall. The fire was upgraded from two alarms to three at around 1:50 p.m., Marshall said.

The blaze burned in Orinda Oaks Park between the areas of Ivy Drive and Donald Drive. High winds pushed smoke toward Lafayette, officials said. Chief Randall Bradley emphasized that fire danger rises as temperatures do the same.

"A hot day allows the fire to get going, and we're fortunate the winds weren't strong and the humidity was up," Bradley said. "That combination helps a lot.

"It's going to be a long fire season, and it's starting early this year."

Cal Fire spokesman Daniel Berlant said state fire crews were assisting the Moraga-Orinda Fire Department and that about a half-dozen state fire engines and two bulldozers are on scene helping out.

The cause of the fire, Berlant said, was under investigation.

Check back for details.

Staff writer Natalie Neysa Alund contributed to this report.