The Alamos Fire was reported at 3:22 p.m. Friday on the north side of Los Alamos Hills Sports Park, near the intersection of Los Alamos Road and Ruth Ellen Way, according to the Riverside County Fire Department.
The fire grew to about 72 acres. City officials announced forward progress was stopped as of 5:20 p.m., but containment was at 0%.
Some evacuation orders were downgraded to warnings.
A detailed map of the evacuation area can be found here.
It's unclear what caused the fire.
City News Service contributed to this report.