Three brush fires erupted Thursday alongside state Route 371 on the south end of Aguanga, together scorching about seven acres before crews arrived.
The non-injury blazes were reported about 4 p.m. less than a mile apart, on the south side of the highway, between Yucca and Wilson Valley roads, according to the Riverside County Fire Department.
One fire was roughly five acres, while the other two fires just south of it were each about an acre wide as crews from the county, Murrieta Fire & Rescue and the Pechanga reservation deployed, according to reports from the scene.
The two smaller fires were expected to merge but were moving slowly amid light winds, officials said.
California Highway Patrol officers were directing traffic at the location because of the number of motorists lining up to watch.
Two Cal Fire air tankers and a water-dropping helicopter were called in to make runs on the three brushers.
No homes or other structures were immediately threatened.
There was no word on how the fires started, but they appeared suspicious, according to reports from the scene.