The bomber struck shortly after noon in the American city of Nashville.
The bomber struck shortly after 6:40 a.m. Friday in a car parked on Downtown Road in Nashville, according to a foreign news agency.
The blast shattered the windows of several buildings, and smoke billowed from the crash site.
No further details have been released about the blast.
The fire brigade confirmed that a bomb disposal squad was at the scene and that metro police and federal agencies had cordoned off the area and launched an investigation.
The Bomb Disposal Squad told residents and others to avoid approaching the crash site.
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