Officers were working to evacuate nearby buildings when, around 6:30 a.m., the RV exploded, blowing out the windows of nearby buildings.

Human remains have been found at the scene of the explosion in downtown Nashville, multiple law enforcement sources told ABC News.

The remains have not been identified and it's unclear whether they're identifiable.

\"We found tissue that we believe could be human remains,\" Metro Nashville Police Chief John Drake said at a press conference Friday evening. \"We'll have that examined and we'll be able to tell you from that point.\"

\"PHOTO:
Mark Humphrey/AP
PHOTO: Emergency personnel work near the scene of an explosion in downtown Nashville, Tenn., Dec. 25, 2020.
>
\"PHOTO:
Andrew Nelles/Tennessean.com/USA Today Network via Reuters
PHOTO: A vehicle burns near the site of an explosion in the area of Second and Commerce in Nashville, Dec. 25, 2020.
>

The explosion knocked one officer to the ground. Another officer sustained temporary hearing loss.

Three people were taken to the hospital with minor injuries.

It's not known whether anyone was in the RV when it exploded, authorities said.

Some photos showing damage on 2nd Ave North as multiple agencies continue to work and investigate an explosion from earlier this morning. pic.twitter.com/0cWA3oUCDl

— Nashville Fire Dept (@NashvilleFD) December 25, 2020

Nashville International Airport temporarily halted flights Friday afternoon after losing phone and internet in the air traffic control tower due to the blast.

AT&T said service was impacted in Nashville and surrounding areas because of damage to its facilities from the explosion.

Communications capabilities came back in the tower about an hour after the ground stop was issued and service resumed, the Federal Aviation Administration said.

Footage from the scene on 2nd Ave North as multiple agencies continue to work and investigate an explosion from earlier this morning. pic.twitter.com/5g40RhwNNl

— Nashville Fire Dept (@NashvilleFD) December 25, 2020

Resident Buck McCoy said he heard gunshots before the explosion, which \"blew everything all over the entire apartment.\"

\"All the windows came in from the living room into the bedroom,\" he told ABC News. \"There was glass everywhere from the windows. There wasn't really any part of the apartment that wasn't damaged or pushed or moved or affected by the explosion ... the whole apartment was just completely a mess.\"

\"PHOTO:
Mark Humphrey/AP
PHOTO: Debris scattered a near the scene of an explosion in downtown Nashville, Tenn., Dec. 25, 2020.
>

\"My building is pretty tall and pretty strong so it had to have been a very strong explosion to blow out all those windows,\" he said.

Several buildings suffered structural damage, authorities said.

\"PHOTO:
Mark Humphrey/AP
PHOTO: Emergency personnel work at the scene of an explosion in downtown Nashville, Tenn., Dec. 25, 2020.
>

McCoy said he \"started to go downstairs, saw some people in the hallway -- they were in shock, you know, they're crying.\"

He then reached the street which he said looked \"like a movie ... it was just surreal.\"

The debris field extends for at least a few blocks. Streets around the exploded vehicle have been closed down.

In the search for the suspect, there are \"investigative leads to be pursued\" and \"technical work that needs to happen,\" the FBI said.

\"We will find out what happened here,\" the FBI said.

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. pic.twitter.com/YOfMTaKmTH

— Metro Nashville PD (@MNPDNashville) December 25, 2020

These are pictures from 2nd Avenue south. Windows were broken out from explosion area to Broadway. Please AVOID this area! Media staging is at 2nd Avenue south and KVB. pic.twitter.com/tocdpHWFgj

— Nashville Fire Dept (@NashvilleFD) December 25, 2020

The FBI, the lead investigating agency, asks anyone with information to submit a tip on the FBI website.

Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives have also responded.

\"PHOTO:
Mark Humphrey/AP
PHOTO: Nashville Police Chief John Drake, center, speaks during a news conference, Dec. 25, 2020, in Nashville, Tenn.
>

President Donald Trump, President-elect Joe Biden, acting Secretary of Homeland Security Chad Wolf and acting Attorney General Jeff Rosen have been briefed on the incident.

Authorities said they are not aware of other imminent danger. K-9 officers swept the downtown area as a precaution, police said.

Mayor John Cooper also instituted a curfew for the area affected by the explosion from 4:30 p.m. on Friday to 4:30 p.m. on Sunday.

Our canine teams are doing protective sweeps in the downtown area. Traffic downtown is restricted. pic.twitter.com/SAH25JZwIg

— Metro Nashville PD (@MNPDNashville) December 25, 2020

ABC News' Mina Kaji contributed to this report.

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