RIVERSIDE (CBSLA.com) — Firefighters Friday quickly gained an upper hand on a brush fire that erupted in Riverside.

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The California Department of Forestry and Fire Protection (Cal Fire) initially reported that the fire along the 1500 block of Research Park Drive was between five to 10 acres.

The Palmyrita Fire broke out just after 2 p.m. a mile east of where the 60, 91, and 215 freeways meet.

By 3:47 p.m., fire officials reported that 40 acres had burned. The fire was 20 percent contained.

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Aerial footage showed that the fire near Box Canyon Park was burning in light-to-medium brush.

An aircraft and water-dropping helicopters were dispatched to the firefight, along with the Riverside City Fire Department.

No structures were threatened.

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No further information was immediately available.