FBI and ATF agents search the basement of a home Saturday, Dec. 26, 2020, in Nashville, Tenn. An explosion that shook the largely deserted streets of downtown Nashville early Christmas morning shattered windows, damaged buildings, and wounded three people. (AP Photo/Mark Humphrey)NASHVILLE, Tenn. – The man believed to be responsible for the Christmas Day bombing that tore through downtown Nashville blew himself up in the explosion, and appears to have acted alone, federal officials said Sunday. Investigators used DNA and other evidence to link the man, identified as Anthony Quinn Warner, to the mysterious explosion but said they have not determined a motive. “Nashville is considered safe," said Metro Nashville Police Chief John Drake. Associated Press writer Scott Stroud and photographer Mark Humphrey in Nashville contributed to this report.