A fire east of Hemet forced closure of Highway 74 Sunday in Idyllwild and Valle Vista, northeast of Lake Elsinore.
The Blackburn Fire was reported at 1 p.m. on Highway 74, east of Hemet, Cal Fire officials said.
According to published reports, three homes were threatened but no evacuations had been ordered Sunday afternoon.
Cal Fire was assisting the U.S. Forest Service in its battle against the blaze.
A SigAlert for stopped traffic was issued for State Route 74 and State Route 243. The fire was burning close to Mountain Center.