RIVERSIDE (CBSLA.com) — Four firefighters escaped injury when their fire truck crashed in front of a Riverside home Thursday as the county declared a local emergency while battling the 22,800-acre Mountain Fire near Idyllwild.

The accident occurred at approximately 3:20 p.m. in front of a house on the 8800 block of Indiana Ave., near Arrowhead Street, officials told City News Service.

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No one on board the vehicle required medical attention and no other injuries were reported.

Authorities are investigating the cause of the crash.

The degree of damage sustained by the Riverside Fire Department truck has not yet been reported.

The accident occurred as nearly 3,000 firefighters continued to battle the 35-square-mile Mountain Fire Thursday, forcing evacuations in Idyllwild and Fern Valley.

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The blaze was 15 percent contained as of 4 p.m. Thursday.

Officials say Riverside County could be eligible for disaster funds after declaring a local emergency.

To date, to fight the fire has cost $5.5 million to fight. State and federal officials will have to approve the release of relief funds.

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