Investigators looking into the Christmas morning explosion in Nashville now believe the blast was likely the result of a suicide bombing, according to two law enforcement sources with direct knowledge of the investigation.

Officials have previously said they have recovered human remains at the scene of the bombing in downtown Nashville and an FBI official on Saturday said agents are not looking for another suspect.

Agents are also at a home in Antioch, just southeast of Nashville, to conduct "court-authorized activity," FBI spokesman Jason Pack told CNN. According to a law enforcement official, a tip about the vehicle involved in the explosion on Christmas morning led law enforcement to the Antioch home.

Bomb technicians have cleared the house to ensure it is safe for an evidence team to enter, Pack said. Investigators are now waiting for the evidence team to arrive and enter. Pack would not confirm who lives at the house, but neighbor Steve Schmoldt told CNN that his wife noticed law enforcement trucks last night in the neighborhood.

A recreational vehicle at the home seen via Street View on Google Maps appears to match the one law enforcement has asked the public for information on. Investigators believe the RV seen in the photos is the same one at the center of the explosion, the law enforcement source said, but they can't be certain because it was destroyed in the blast.

The blast occurred Friday at 6:30 a.m. CT, after a computerized voice emanating from a parked RV loudly urged people to evacuate, warning the vehicle would explode in minutes.

The RV's explosion left at least three people injured, set several other vehicles on fire, destroyed a number of buildings on the block and knocked out wireless service in much of the region.

As the investigation continues, there are no signs of an active manhunt, an indication that investigators are not looking for someone who still poses a danger to the public, several law enforcement sources tell CNN.

Officials have said they are confident the explosion was "intentional." Still, the Christmas date, the early morning timing and the unusual warnings broadcast on loudspeaker before the explosion indicate that this was no attempt at mass murder.

The blast tore into at least 41 businesses on Second Avenue in Nashville, a street full of historic buildings. Concerned about the structural integrity of the affected buildings, the city cordoned the area off and won't allow anyone in until Sunday afternoon.

Several local residents told CNN they woke to the sound of gunfire early Friday morning. Police said they were called to the location after a report of shots fired around 5:30 a.m.

Once on scene, police found a white RV parked in front of an AT&T transmission building at 166 Second Ave. North. The RV was repeatedly broadcasting a message warning of an explosion set to occur in 15 minutes, police said.

"This vehicle will explode in 15 minutes," the voice said, according to Betsy Williams, who was staying at an apartment on Second Avenue. After repeating that message for a minute, the voice then said the vehicle will explode in 14 minutes, and continued counting down from there. (Text, excluding headline,, courtesy CNN)

Update news