Click photo to enlarge
A firefighter works on hotspots among the trees as crews finish off a brush fire near Skyline Blvd. in the hills above Oakland, Calif. on Monday, May 20, 2013. (Kristopher Skinner/Bay Area News Group)

OAKLAND -- City and state fire crews planned to keep tabs on hot spots through Tuesday morning in the Oakland hills, where a blaze early Monday scorched 2½ acres in Joaquin Miller Park.

No homes were damaged, and no injuries were reported in the fire, which began just after 1:45 a.m. near a park trail, Oakland Fire Department Battalion Chief Coy Justice said.

The fire burned south of Skyline Boulevard, less than a mile from the Roberts Recreation Area, near Sequoia Point. It charred brush and left tall trees singed about 500 feet northwest of Skyline, fire officials said.

Crews attacked the blaze from Skyline and Joaquin Miller Road, keeping the fire from spreading to nearby homes, Justice said.

"We were fortunate because it's been dry up there for quite some time," Justice said.

The fire was under control by about 4:30 a.m., said Battalion Chief Lisa Baker.

Crews expected to be at the scene until 8 a.m. Tuesday, monitoring for possible hot spots and flare-ups.

"It's hot and dry, and that combination is never good," Baker said. "Fortunately, there are no winds right now."

Oakland firefighters were joined by state firefighters in the effort.

Part of Skyline remained closed to traffic until about 9:30 a.m. Monday

Investigators were trying to determine the cause of the fire, and there is a possibility it started at an illegal campsite, officials said.

Staff Writer Harry Harris contributed to this story. Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.