Nashville explosion 'probably suicide bombing'
A RV explosion in Nashville on Christmas Day was likely a suicide bombing, US media say.
Investigators are conducting DNA tests after human remains are found near the site of the powerful explosion.
The home of a possible person of interest was searched on Saturday in the Nashville suburb of Antioch.
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The blast injured three people and disrupted communications systems in Tennessee and four other states.
A motive for the explosion in the state of Tennessee has not yet been found, and no one has said they were behind it.
Meanwhile, companies and TV personalities have offered more than $ 300,000 (£ 224,000) to catch those responsible.
What are the latest developments?
According to two law enforcement agencies quoted by CNN, investigators now believe the explosion was likely the result of a suicide attack.
Police officers are searching the property of a possible person of interest in Antioch, near Nashville
CNN also quoted an FBI official as saying agents are not looking for another suspect after the human remains are found.
CBS News says the leading theory now is that the subject could have been killed in the explosion.
Newsweek reports that investigators are trying to find the suspect's mother for DNA testing.
FBI special agent in charge Douglas Korneski previously said the officers had received about 500 tips that may be related to the explosion.
After visiting the website, Tennessee Governor Bill Lee said it was a "miracle" that no one was killed.
He said he had asked President Donald Trump for a federal emergency declaration for his state in support of relief efforts.
What happened in Nashville?
Officials responded to reports of gunfire just before 6:00 a.m. local time (12:00 p.m. GMT) on December 25 in a neighborhood known for its restaurants and nightlife.
Shortly afterwards, they found a motor home sending a warning to leave the area.
The van exploded a few minutes later when the force of the explosion knocked a police officer off the feet, the police said.
Police released this picture of the delivery truck, referred to as a recreational vehicle (RV) by Nashville police, arriving at the scene early Friday.
The van exploded in front of a building owned by telecommunications giant AT&T, which is also near an office tower.
Buildings were structurally damaged, windows were blown out and trees felled. Videos posted on social media showed water from damaged pipes running along walls as alarms wailed in the background.
Police emergency systems have been shut down across Tennessee.
Tennessee, Mississippi, Kentucky, Alabama, and Georgia also saw phone, Internet, and fiber-optic television services being disrupted, according to telecommunications company AT&T.
The explosion was caused by a parked RV, police say
Resident Buck McCoy said he was awakened by the explosion. He posted a video on Facebook showing some of the damage done, with alarms wailing in the background.
"All of my windows, every single one of them was blown into the next room. If I had stood there it would have been horrible," Mr. McCoy told AP. "It felt like a bomb. It was so big."
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