SHERMAN OAKS (CNS) — City firefighters, with an assist from L.A. County Fire Department, finally prevailed over a stubborn brush fire in Sherman Oaks Sunday that charred about 20 acres of grass and left three people injured.

The blaze started near 15350 Burbank Blvd. in the Sepulveda Basin just before 1 p.m., according to Los Angeles Fire Department spokesman Nicholas Prange.

The department sent more than 100 firefighters to the scene, Prange said. With help from L.A. County hand crews, LAFD volunteers and a sky crane, firefighters finally contained the blaze protecting nearby Japanese gardens and a water reclamation plant.

Major streets also served as fire breaks helping to contain the fire, which was fully contained after an estimated three hours, 17 minutes, he said.

The fire left two firefighters and a civilian with non-life- threatening injuries, he said.

The California Highway Patrol declared a SigAlert and temporarily shut down lanes on the southbound 405 (San Diego) Freeway near Burbank Boulevard. Those closures were lifted around 4:45 p.m., but the Burbank Boulevard off-ramps remained closed.