A brush fire sparked by a burning vehicle that scorched about 50 acres in the Angeles National Forest was about 45% contained Thursday.
The Antonio Fire was reported just before 2:30 p.m. Tuesday in about a half-acre of medium brush in the area of Glendora Ridge Road and Mount Baldy Road, according to the Los Angeles County Fire Department.
The fire quickly traveled uphill, causing the closure of Mount Baldy Road and the Claremont Wilderness Park.
Firefighting helicopters were deployed to aid fire crews in dousing the blaze, which grew within two hours to 50 acres.
As of Thursday afternoon, fire remained at about 50 acres but was reported to be 45% contained, Angeles National Forest officials said.
No structures were threatened by the fire.