The number of people killed by a massive blaze in northern California rose to 42 on Monday, making it the deadliest wildfire in the history of the state. Thousands of firefighters spent a fifth day digging battle lines to contain the "Camp Fire" in the foothills of the Sierra Nevada mountains.

"As of today, an additional 13 human remains have been recovered, which brings the total number to 42," Sheriff Kory Honea told a news conference. The blaze is "the deadliest wildland fire in California history," Honea said. Although it is difficult to be certain due to inconsistencies in record keeping and categorization, the Camp Fire appears to deadliest American wildfire in a century -- since the Cloquet Fire killed an estimated 1,000 people in Minnesota in 1918.