The man police say was responsible for the Christmas morning explosion in downtown Nashville mailed packages before the bombing containing material about his views on bizarre beliefs, according to the FBI.

Federal law enforcement said Saturday the FBI was investigating the mailed materials.

"We're aware the suspect sent materials which espoused his viewpoints to several acquaintances throughout the country," FBI Special Agent Jason Pack said in a statement to the Tennessean.

Anyone who may have received a package or material from Anthony Quinn Warner are encouraged to contact the FBI at  800-CALL-FBI.

Read more: The Tennessean