The violent explosion that rocked downtown Nashville, Tenn., on Christmas morning is believed to be a suicide bombing by Anthony Q. Warner, 63, U.S. Attorney Don Cochran said, writes NRP.

Authorities continue to ask those who knew or encountered the suspect to contact the FBI. The agency is still investigating, but there is no indication that anyone else was involved, Cochran said.

Officials said DNA testing of human remains on the scene matched to Warner. They said no other threats were known against the city but wouldn’t comment on possible motives for the bombing.

According to NPR member station WPLN, Warner had owned a home in the suburban Nashville community of Antioch that was searched by federal officials.

The investigation into the bombing has brought hundreds of law enforcement personnel - including agents from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives - into the Tennessee capital to comb through the wreckage and investigate more than 500 leads.