A 45-acre brush fire that started Friday morning in Alameda County is now 100% contained.
Cal Fire tweeted at 8:05 p.m. last night that firefighters had completely contained the fire near Geary and Calaveras Roads, just outside the Sunol Regional Wilderness.
Firefighters first responded to the fire at 4:30 a.m. Friday, Alameda County Fire Department spokeswoman Aisha Knowles said. By 8:50 a.m. the fire had burned 20 acres, a Cal Fire official said.
By 3:30 p.m. the fire had grown to 45 acres and was 50 percent contained, the official said.
Knowles said lightning may have started the fire.
A Cal Fire official said firefighters kept the fire from damaging any structures and no one was injured.