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Authorities are trying to determine why that location was selected for detonation and the composition of the explosive, sources said, and have been gathering samples to send to a lab for analysis.

Other investigators are working with behavioral analysts to understand what might have prompted somebody to commit the \"intentional act\" of blowing up the RV after warning people to stay away, sources said.

Officers worked to evacuate nearby buildings before the explosion. The department identified them Friday night as Officer Brenna Hosey; Officer James Luellen; Officer Michael Sipos; Officer Amanda Topping; Officer James Wells; and Sergeant Timothy Miller.

\"PHOTO:
Metropolitan Nashville Police Department
PHOTO: Nashville police identified six officers who helped evacuate the area before an explosion on Dec. 25 (clockwise from top left):Michael Sipos, James Wells, Amanda Topping, James Luellen, Brenna Hosey, and Timothy Miller.
>

The officers were lauded as heroes during a press conference Friday, as they \"took swift action and directed people away from danger,\" Nashville Mayor John Cooper said.

\"The officers saved lives today,\" Drake also said. \"They immediately began knocking on doors, not knowing if the bomb was going to go off immediately. They didn't care about themselves, they didn't think about that, they cared about the citizens of Nashville.\"

Tennessee Gov. Bill Lee also praised the \"swift action\" of Nashville police and local law enforcement after touring the site of the explosion Saturday morning.

\"The damage is shocking and it is a miracle that no residents were killed,\" he said on Twitter.

This morning I toured the site of the bombing. The damage is shocking and it is a miracle that no residents were killed. @MariaLeeTN and I continue to pray for those who sustained injuries from the blast.

— Gov. Bill Lee (@GovBillLee) December 26, 2020

Three people were taken to the hospital with minor injuries. Human remains were found at the scene, multiple law enforcement sources told ABC News. The remains have not been identified as of Saturday afternoon.

At least 41 buildings on Second Avenue were damaged, some extensively, authorities 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

Lee said he has requested an emergency declaration from President Donald Trump \"to support ongoing efforts and relief.\"

The vehicle exploded outside an AT&T transmission building. Service continues to be impacted in Nashville and surrounding areas because of damage to its facilities.

A fire reignited overnight, leading to the evaluation of the building, AT&T said in a statement Saturday morning. Teams have drilled holes into the building in an attempt to reconnect power to critical equipment, and are also rerouting services to other facilities in the area, it said.

\"PHOTO:
Elliott Anderson/Tennessean.com/via Reuters
PHOTO: Debris litters the road near the site of an explosion in the area of Second and Commerce in Nashville, Tenn., Dec. 25, 2020.
>

The company has set up two portable cell sites in downtown Nashville, \"with numerous additional portable sites being deployed in the Nashville area and in the region,\" it said.

Because investigators still don't know if the telecom giant was the intended target, federal authorities have asked police around the country to increase patrols around AT&T facilities as a precaution.

\"Due to the circumstances that took place Dec, 25th in Nashville, we ask that patrol divisions provide extra watch on any AT&T building located in any metropolitan building across the nation,\" according to the text of a federal bulletin obtained by ABC News. \"AT&T partners with law enforcement, firefighters and first responders. We are public safety partners giving connectivity to agencies across the country.\"

The Federal Aviation Administration has issued a temporary flight restriction for Nashville, classifying the airspace as National Defense Airspace. Pilots who do not follow the restriction could be detained, the FAA warned.

The FBI and the U.S. Department of Justice's Bureau of Alcohol, Tobacco, Firearms and Explosives are leading the investigation.

The FBI is asking anyone with information to submit a tip on its website.

ABC News' Marcus Moore, Jeff Cook, Darrell Calhoun, Jenny Wagnon Courts, Josh Hoyos, Ahmad Hemingway and Sam Sweeney contributed to this report.

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