Daily US Times: The law enforcement officials said the camper van blast in Nashville on Christmas Day was probably a suicide bombing.
Investigators are conducting DNA tests after human remains were found near the site of the heavy blast.
The home of a potential person of interest was searched on Saturday in Nashville’s suburb of Antioch.
The blast injured three people and disrupted communications systems in all across Tennessee and four other states.
No motive has yet been founded for the explosion, and no-one has yet said they were behind it.
Meanwhile, TV and businesses personalities have offered more than $300,000 to catch those responsible.
According to two law enforcement sources cited by CNN, investigators now believe that the blast was likely the result of a suicide bombing.
The network is also quoting an FBI official as saying that agents are not looking for another suspect after the human remains were found.
CBS News reported that the leading theory now is that the subject may have been killed in the blast.
Newsweek reported that the investigators are trying to find the suspect’s mother to conduct DNA tests.
FBI Special Agent in Charge Douglas Korneski earlier said officials had received about 500 tips possibly relating to the blast.
Tennessee Governor Bill Lee said after visiting the site that it was a “miracle” that no-one had been killed.
He said he had asked President Trump for a federal emergency declaration for his state to aid relief efforts.