An explosion in a motor home on Christmas Day was caused by a suicide bomb, authorities believe. The home, parked on a downtown street of Tennessee's largest city Nashville, exploded at dawn on Friday moments after police responding to reports of gunfire noticed it and heard an automated message emanating from the vehicle warning of a bomb.
The thunderous, fiery blast destroyed several vehicles, damaged more than 40 businesses and left a trail of shards from shattered windows.
Federal agents investigating the explosion were searching a two-story suburban house on Saturday for clues to the blast, which injured three people in the heart of America's country music capital.
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