Authorities are looking into evidence that Nashville, Tennessee, bombing suspect Anthony Quinn Warner had an interest in numerous conspiracy theories.
Warner, who was identified after investigators matched tissue found at the scene to DNA from his gloves and hat, was killed in the Christmas Day RV bombing.
One theory was the existence of "lizard people," which is a belief that shape-shifting reptilian creatures who are bent on world domination appear in human form. Warner is also believed to have spent time hunting for alien life forms.
Investigators found writings about assorted conspiracy theories, as well as looked into whether Warner had paranoia about 5G cellular technology. However, it is unknown if any of his beliefs or behaviors are connected to the explosion.
Investigators continue to analyze chemical residue from the scene and are looking into how the suspect acquired the bomb-making materials.
FBI and ATF agents, along with behavioral analysts, are trying "to understand why this happened" by interviewing people who knew the suspect.