A brush fire broke out alongside state Route 52 near Mission Trails Regional Park Friday afternoon, snarling rush-hour traffic in the area but causing no reported structural threats.
The blaze began spreading on a hillside next to the northern side of the freeway near Mast Boulevard for unknown reasons about 4:30 p.m., according to the San Diego Fire-Rescue Department.
As crews on the ground and aboard firefighting aircraft attacked the flames, the California Highway Patrol shut down the three westbound lanes of state Route 52, but allowed traffic to get past the closure via the left-hand shoulder.
Within an hour, the blaze had scorched 10 to 15 acres, SDFRD spokeswoman Monica Munoz said.
Personnel with Cal Fire and Heartland Fire & Rescue were helping San Diego city crews extinguish the flames.
By 6 p.m., firefighters had the spread of the blaze halted at an estimated 21 acres, Munoz said.
–City News Service