The camper van blast in Nashville on Christmas Day was probably a suicide bombing, law enforcement officials are quoted as saying by US media.
Investigators are conducting DNA tests after human remains were found near the site of the powerful blast.
The home of a possible person of interest was searched on Saturday in Nashville’s suburb of Antioch.
The blast injured three people and disrupted communications systems in Tennessee and four other states.
No motive has yet been established for the explosion in the state of Tennessee, and no-one has yet said they were behind it.
Meanwhile, businesses and TV personalities have offered more than $300,000 (£224,000) to catch those responsible.
Investigators now believe that the blast was likely the result of a suicide bombing, according to two law enforcement sources cited by CNN.
NASHVILLE, Tenn. (AP) — Federal investigators have identified a person of interest in connection with the explosion that rocked downtown Nashville on Christmas Day and were searching a home associated with that person, law enforcement officials said Saturday.
Investigators from multiple federal and local law enforcement agencies were at a home in Antioch, in suburban Nashville, after receiving information relevant to the investigation, said FBI Special Agent Jason Pack. Another law enforcement official, who was not authorized to discuss an ongoing investigation and spoke to The Associated Press on condition of anonymity, said investigators regard a person associated with the property as a person of interest in the bombing.
Earlier Saturday, investigators said at a news conference they are looking at a number of individuals who may be connected to the bombing but have also found no additional explosive devices- indicating no active threat to the area.
Douglas Korneski, the
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