Source: Cassandra Fairbanks

A massive explosion in downtown Nashville that sent debris multiple city blocks has been deemed “intentional” by investigators.

The Christmas Day explosion came from an RV — and could be seen “miles away” according to reports.

MNPD, FBI & ATF investigating the 6:30 a.m. explosion on 2nd Ave N linked to a vehicle. This appears to have been an intentional act. Law enforcement is closing downtown streets as investigation continues,” the MNPD tweeted.

“Police responded to reports of a suspicious vehicle parked outside the AT&T building just before 6 a.m. Upon arrival, police said an officer ‘had reason’ to alert the department’s hazardous devices unit, which was en route, when a ‘significant explosion’ happened,” the Tennessean reports.

Three people were hospitalized with injuries. First responders were unable to begin searching buildings until they were cleared by the bomb squad, but have search and rescue and cadaver dogs on the scene.

There have been reports of gunfire before and after the explosion — as well as live ammo exploding inside of a vehicle that was ablaze.

“Explosion in downtown Nashville, apparently from parked vehicle on 2nd Ave. Fire department personnel being told to pull back two blocks from explosion site, concerned about potential vehicle bombs. Police bomb squad and fire hazmat team on scene,” local reporter Phil Williams tweeted.

The Metro Nashville Police tweeted shortly after 9 a.m. that “an explosion linked to a vehicle occurred at 6:30 this morning outside 166 2nd Ave N downtown. Investigation active by MNPD & federal partners.”