 Arizona News Radio in Tucson, U.S. Attorney for Arizona Gary Restaino says the FBI and campus police arrested 27-year-old Michael Lee after learning of a series of group social media messages threatening mass shootings on the University of Arizona campus. Lee did not have a firearm at the time of the arrest in this case in October 23, but a firearm was found at a storage unit a month prior as part of a search warrant for the state-controlled substance offense, and we understand he had purchased another firearm from a local pawn shop the year before.