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A massive fire that has charred more than 147,000 acres in Southern California and destroyed dozens of homes north of Los Angeles was caused by arson, a U.S. Forest Service spokeswoman said Thursday.

A homicide investigation has been initiated by the Los Angeles County Sheriff's Department into the deaths of two firefighters as a result of the Station fire, said spokeswoman Rita Wears. The firefighters died Sunday in a vehicle crash while trying to escape fast-moving flames.

The fire was at 38 percent containment Thursday. It has been burning for more than a week. Fire officials said progress has been made, particularly on the west side of the fire, but the blaze was still producing hot spots, including one that forced the evacuation of 25 residents early Thursday. Watch CNN's Brian Todd on the investigation Read full article »

CNN's Barbara Starr in Lake View Terrace, California, contributed to this report.

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