NASHVILLE, TN (WSMV) - Federal authorities are continuing to investigate after an explosion rocked downtown Nashville early Friday morning, damaging dozens of businesses and injuring at least three. 

Metro Police believe the explosion that occurred outside the AT&T transmission building on Second Ave North was "an intentional act."

Sources told News4 authorities found human remains near the RV and are investigating whether they were from an innocent person or someone involved in the explosion.

Nashville Fire said one building collapsed due to the explosion. 

MNPD Public Information Officer Don Aaron said police responded to a shots fired call on Second Avenue North around 5:30 a.m. Friday.

When officers arrived on the scene, there was no evidence to indicate a shooting, but they found a "suspicious RV parked on the street." 

Police called the Hazardous Devices unit to the scene to investigate when the RV detonated at 6:30 a.m..

Chief Drake said a message warning people to evacuate the area came from the RV before it exploded. The message said a potential bomb would detonate within 15 minutes.

Police say one officer was knocked to the ground by the blast but was uninjured. One officer sustained temporary hearing loss as well.

It is unclear if anyone was inside the RV at the time of the explosion.

Police said they do not believe there is any imminent danger to Nashville at this time. 

Nashville Fire confirmed three people were transported to the hospital without significant injuries. 

Speaking to the press Friday evening Mayor John Cooper said at least 41 buildings had been damaged. 

"It looks like a bomb went off, or an explosion I should say," Mayor Cooper said.

Emergency crews have closed a 10-block radius around the site of the explosion. A Metro Police bomb disposal unit was called the scene.

K-9 units are searching the area for a possible second explosive device, though police say there is no indication at this time of a second device. 

Fire crews said windows were broken out from the explosion area to Broadway and are encouraging people to avoid the area if possible.

Smoke was visible on the Nashville skyline early Friday morning as people in the surrounding areas as far as College Grove and Mt. Juliet reported feeling a large shaking. 

AT&T is reporting a widespread outage to their services due to damage to their building from the explosion. Officials at BNA said flight corridors were closed due to the outage. Emergency services across the midstate and parts of Kentucky reported outages as well. 

Metro Police, FBI and ATF are currently investigating the scene. 

Follow News4 for the latest updates. 

Content Producer

Blake was born and raised in Central Ohio where he began working in TV broadcast in 2011 before moving into morning radio. Blake joined the WSMV team in October 2019. Any news stories and ideas can be sent directly to blake.summers@wsmv.com

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