A massive explosion rocked downtown Nashville on Christmas morning.
Here's what we know about the incident:
Nashville explosion location, what happened
Nashville police and fire crews responded to reports of a suspicious RV parked outside an AT&T building near Second Avenue and Commerce Street just before 6 a.m. Friday.
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.
Police and firefighters responded to the area about 6:45 a.m.
Metro police spokesman Don Aaron said it was unclear if anyone was inside the RV when it exploded.
Downtown, surrounding interstates closed
All downtown Nashville roads, including interstates leading into the city, are shut down.
As of about 9:45 a.m. all roads leading into the city inside the downtown loop were closed including the following interstate systems:
The downtown area will be "sealed off" for further investigation and to make sure everything is "completely safe," according to Nashville Mayor John Cooper.
Injuries were reported
Just before the blast, officers were conducting door-to-door checks in the area and redirected a man walking his dog along the street.
The force of the explosion knocked an officer to the ground.
At least three people are hospitalized, authorities said.
The identities of those hurt and the extent of their injuries was not immediately known.
Multiple law enforcement agencies are on scene
Metro police, the Tennessee Bureau of Investigation, ATF and the FBI are investigating the incident.
The Nashville Fire Department said a bomb squad was also on scene.
Extent of damage
Nashville Mayor John Cooper toured the damage Friday morning and said about 20 buildings had been impacted.
"It looks like a bomb went off," Cooper said.
He said it was too soon to draw any conclusions but said updates would come as soon as possible.
Listen to this crooked motherfucker, what is so funny?
I like how he gets caught up in laughing so much that he has to pull himself back to the narrative.
Video stating "If you can hear this message evacuate now before the explosion.
NASHVILLE Explosion: Explosion In Downtown Nashville Believed To Be 'An Intentional Act'
Clip is from Live coverage from WKRN News 2 following a Christmas morning "intentional" explosion in downtown Nashville.