Firefighters in Sun Valley Sunday knocked down a small fire within a container at a metal plating facility, which was held in check by the structure’s fire sprinkler system, authorities said.

Firefighters were dispatched at 6:59 a.m. to 9939 N. Glenoaks Blvd., where they used a hand-held fire extinguisher to douse the flames, said Brian Humphrey of the Los Angeles Fire Department.

It was not immediately clear what was inside the container.

No injuries were reported.

“Per protocol, an LAFD Hazardous Materials team has been summoned to assist with a detailed site assessment,” Humphrey said.