Fire crews working through the night beat back flames and built containment lines around a two-day old wildfire that charred nearly 22 square miles of brush in the high desert north of Los Angeles.

The blaze was 62 percent contained Saturday morning and no structures were threatened, according to Los Angeles County Fire Capt. Sam Padilla.

Crews hoped to close the fire's south flank near Portal Ridge, Rancho Vista and Ana Verde before temperatures rise into the high 90s and dry winds whip up again as expected Saturday.

"We're getting a handle on it," Padilla said. "As soon as we contain that south end we'll be in better shape."

Padilla said there were no open flames — just smoldering embers — which has significantly slowed the fire's spread.

"The way you work embers is by using hoses on the ground, so we're relying on our foot soldiers today," County Fire Inspector Don Kunitomi said. "It's important to clean up those embers because one hot gust of wind can start a spot fire."

Some 1,300 firefighters were assigned to the blaze Saturday.