An afternoon grass fire burned more than 400 acres Tuesday between Pleasanton and Sunol. The blaze had largely been contained by 5 p.m.
The fire was first reported around 3 p.m. alongside Interstate 680. Approximately 300 firefighters from Alameda County and California Department of Forestry were called in to fight the fire.
CDF air units from Santa Clara County were also called in, said Alameda County Fire Assistant Chief Jim Purchio.
No injuries were reported, and no structures were damaged, Purchio said.
He could not confirm reports that a car fire initially touched off the grass fire, and said the cause of the fire was uncertain.
Smoke from the fire could be seen billowing over southern Pleasanton east as far as downtown Livermore, some witnesses reported.
Purchio said he expected firefighters to be on the scene well into the night watching for hot spots.
Distributed by the Associated Press