NBC News reported Wednesday that investigators have obtained evidence that Anthony Quinn Warner, who died in the explosion, may have subscribed to a conspiracy theory that many of the world’s most powerful figures, from Barack Obama to the late Bob Hope are actually evil, lizard-like extraterrestrials in disguise. Officials told NBC News that investigators, who have been questioning friends and acquaintances and searching for clues of a possible motive for the bombing, have become aware of statements Warner made about the lizard people conspiracy theory — though it wasn’t immediately clear what those statements were. Authorities also reported that Warner made statements to others about hunting possible aliens during previous camping trips he took in his RV.

The so-called lizard people conspiracy theory has taken a back seat to some of the newer and more widely publicized baseless beliefs that have come to dominate the conspiracy landscape in recent years. But in 2013, a survey conducted by Public Policy Polling found that 12 million Americans believed that the country was run by lizard people in suits.