The Pico Fire reached 100 percent containment Tuesday night after blazing through 128 acres in Stevenson Ranch over two days, according to Los Angeles County Fire Department officials.

The cause of the fire remained unknown Tuesday while the investigation continues, said Vanessa Lozano of the LACoFD.

Firefighters stopped forward progress on the blaze by 2:31 p.m. Monday, less than two hours after it was first reported around 1 p.m.

Then Fire personnel worked to contain the fire and mop up any hot spots through Tuesday evening, officials said.

The Pico Fire burned in the unincorporated Santa Susana Mountains near Pico Canyon Road in Stevenson Ranch. Fire officials did not call for evacuations, but warned nearby residents to be ready.

Related story: Pico Fire: Forward Progress Stopped, 90 Acres Burned

Residents in the area watched as helicopters and firefighters worked quickly during 106-degree temperatures to contain the blaze.

Due to the high ambient temperatures, three firefighters were treated for minor heat-related injuries.

Approximately 200 firefighters, several helicopters and aircraft responded to the Pico Fire, according to Fire officials.

A landing site was set up on the top of Poe Parkway to allow responding helicopters to refill their water tanks. They were released from the incident shortly after 2:30 p.m. Monday.

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