 or anyone else that was involved at this point. He said that the federal agency, which identified the gunman as Thomas Matthew Crooks of Bethel Park, Pennsylvania, believes the 20-year-old was a lone actor. So quick, so quick to come up with that conclusion. It appears that he was a lone actor, but we still have more investigation to go, he said. We are investigating this as an assassination attempt, but also looking at it as a potential domestic terrorism act.