A parked motor home exploded in downtown Nashville, Tennessee, on Christmas morning in what police described as an "intentional act." Fire officials reported taking three people to the hospital, but none were critically injured.
Police initially responded to an emergency call of "shots fired" in the downtown tourist area about 6 a.m. When the vehicle was seen, it raised suspicion, said Nashville police spokesman Don Aaron, but he didn't say why.
"Circumstances about the vehicle caused the officers to call the bomb squad," Aaron said. The bomb squad was on the way when the explosion occurred.
"We do believe that the explosion was an intentional act," he said, describing the explosion as "significant" and adding that police were working with federal authorities including the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives.
Andrew McCabe, a former deputy FBI director, told CNN that police may have been the target of the explosions, given they were answering the report of a suspicious vehicle when it blew up. He said an explosion of this size would be investigated as a possible act of terrorism, whether domestic or foreign.
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Moments before the blast, police officers went door-to-door in nearby buildings to hustle residents to safety and motioned a man walking his dog near the vehicle to change direction.
Police said it was not immediately clear if anyone was inside the motor home when it exploded.
The explosion, which could be felt nine blocks away, knocked one officer off his feet and caused what was hoped to be only a temporary hearing loss, the spokesman said. Residents reported seeing a number of other vehicles on fire amid the debris.
Most of the buildings were closed given the hour and Christmas holiday in the heart of the city.
"There was trees lying everywhere, glass lying everywhere," Nashville resident Buck McCoy told CNN.
The explosion destroyed several other vehicles and damaged several buildings, launching black smoke in the sky that could be seen for miles.
"We are not aware of any other attempted explosion," the spokesman said.
Nashville Mayor John Cooper urged people to stay away from the downtown area, as police and federal authorities investigated, aided by bomb dogs and surveillance camera footage.
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President Donald Trump was briefed on the explosion, a White House spokesman said.
UPDATE: This story was originally published at 10:42 a.m. and updated with more information at 12:30 p.m.
Editing by Howard Goller
