U.S. authorities are searching for eight people as a huge wildfire rages in northern California. The Dixie Fire has become the third largest wildfire in the state's history. It has been burning for more than 20 days, forcing mass evacuations. It's now about 20 percent contained after having scorched 180,000 hectares. Cooler and calmer weather this weekend is giving firefighters a break. The cause remains under investigation.