Firefighters worked to put out a fire in the Old Town area that sparked Saturday afternoon.
A large amount of smoke was first reported near Morena Boulevard and Napa Street around 3 p.m.
Fire officials say the blaze was burning vegetation in a riverbed.
Crews were able to fully contain it at roughly an acre and a quarter, and nothing was damaged by the flames.
Investigators are still trying to determine the cause of the fire.