The investigation is ongoing in the US state of Tennessee following a massive car explosion in the capital Nashville on Christmas morning.
Reports say the blast originated from a recreational vehicle parked in the center of the city and was felt several blocks away.
Official images of the incident show damaged vehicles and several buildings, with smoke rising into the sky from the scene.
City firefighters reported that they took three people to the hospital with minor injuries. No significant injuries or deaths have been reported at the time of this report.
Nashville Metro Police Department spokesman Don Aaron described the blast as significant and said it was suspected of “an intentional act.”
“The explosion was significant, as you can see. The police department, its federal partners, the FBI and the ATF, are conducting a full-scale investigation up to this point.
“We believe the explosion was an intentional act,” Aaron told reporters.
President Donald Trump and Acting Attorney General Jeff Rosen were reportedly briefed on the incident.
The FBI is now the lead investigative agency. Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives are responding, reports say.