Detectives investigating a huge explosion in Nashville say they have received over 500 leads and are now putting together the “giant jigsaw puzzle”.
The blast – which happened on Christmas morning – originated from a motorhome which had broadcast a warning it was going to detonate within 15 minutes, sending people racing to evacuate.
Three people were taken to hospital, although it is believed they did not suffer serious injuries, and dozens of nearby buildings were damaged.
It is not yet known who set off the explosion or what their motive was.
US attorney Don Cochran said the scene was “like a giant jigsaw puzzle created by a bomb” and that investigators from the FBI and ATF were working to piece together what happened.
There are roughly 250 FBI agents, analysts and staff working on the investigation and specialised bomb technicians are in Nashville.
Speaking at a news conference the day after the blast, FBI special agent Doug Korneski said there was no indication of more explosive threats and no other devices had been found.
Authorities said on Friday they had found “tissue” which could be human remains near the site of the explosion, but they did not comment further on this during the news conference.
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