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Firefighters on Tuesday were battling a brush fire in the Mount Baldy area, officials said.

The blaze, dubbed the Antonio Fire, sparked just after 2 p.m. when a vehicle caught fire in the area of Glendora Ridge and Mt. Baldy roads and spread to the brush, the Los Angeles County Fire Department reported.

“This fire is 100% in the forest with no structures threatened,” the Fire Department said in a tweet.

The fire, which started at about 10-acres, is burning uphill in rough terrain at a moderate rate of spread.

As of 5 p.m., the blaze grew to about 50 acres with no containment, officials from the Angeles National Forest said.

Smoke from the fire could be seen from the Glendora, La Verne, Claremont, Upland, San Antonio Heights and Rancho Cucamonga.

Just after 8 p.m., fires officials reported the fire was holding at 50 acres as crews continued to build hose lines and containment.

Due to the fire, Glendora Mountain and Glendora Ridge roads have been closed.

Claremont Hills Wilderness Park is also closed.

No injuries have been reported.

The San Bernardino County Fire Department and L.A. County Fire Department are on scene assisting the Angeles National Forest with the Antonio Fire. Water dropping helicopters are also working from above to get the fire under control.

Check back for updates on this developing story.