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FBI and ATF agents and behavioral analysts are also continuing to interview people who knew the suspect \"to try to understand why this happened,\" the FBI said.

Anyone who knew the suspect and hasn't yet spoken with investigators is asked to call 800-CALL-FBI.

The #FBI, @MNPDNashville & @ATFHQ continue to ask that those who may have known Anthony Quinn Warner or encountered him, call 1-800-CALL-FBI or submit a tip online at https://t.co/5F7LGAvEVF. @ATFNashville https://t.co/PuSFMNbh3D https://t.co/H0MVT4pkfg pic.twitter.com/AXBOpW9lSc

— FBI Memphis (@FBIMemphis) December 28, 2020

Before the explosion, an eerie recording counted down to detonation and the Petula Clark song \"Downtown\" played from the RV. On Tuesday, Clark expressed her \"shock and disbelief\" at the blast -- and use of her song leading up to it.

\"Of all the thousands of songs -- why this one?\" she wrote in a Facebook post.

\"Of course, the opening lyric is 'When you're alone and life is making you lonely you can always go Downtown.' But millions of people all over the world have been uplifted by this joyful song,\" she wrote. \"Perhaps you can read something else into these words - depending on your state of mind. It's possible.\"

ABC News' Aaron Katersky and Joshua Hoyos contributed to this report.

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