NTSB: Cargo carrier received threat before fire

Federal investigators say a cargo carrier whose plane was burned in an unexplained fire had received a threat a few days before.

The National Transportation Safety Board disclosed the information Thursday. The board did not mention any link between the threat and the fire Saturday.

The blaze damaged a Boeing 767 flown by cargo company ABX Air at San Francisco International Airport. No one was injured.

The fire burned a hole through the upper fuselage of the plane, just behind the cockpit.

Several federal agencies are investigating.

Terra/AP