Investigators looking into the recent explosion in downtown Nashville now believe the blast was the result of a suicide bombing, CNN reported, citing law enforcement sources with knowledge of the investigation.

According media reports, officials had previously said human remains were recovered at the site of the bombing, with FBI officials saying on Saturday that they had stopped looking for another suspect.

Agents are also conducting a search in a house in Antioch, southeast of Nashville, to conduct “court-authorized activity,” FBI spokesman Jason Pack told CNN.

Also read: Nashville blast: Search parties spread out as officials identify person of interest

According to a law enforcement official, a tip about the vehicle involved in the explosion led officials to the Antioch home, CNN reported. FBI Special Agent in Charge Douglas Korneski has said investigators are working the case on “several fronts,”with approximately 250 FBI personnel working on the scene with law enforcement partners.

According to a report by ABC News, investigators are searching properties connected with Anthony Quinn Warne. Though the motive remains unclear, police in Nashville has defined the blast as an “intentional act”. 

The blast occurred on Friday at 6:30 a.m. CT, following a computerized alarm blaring from a parked RV, urging people to evacuate, as the vehicle would explode in minutes.

The RV’s explosion left at least three people injured, and damaged over 30 businesses.