More information has emerged about the gunman in the San Jose mass shooting who killed nine co-workers before turning the gun on himself. A Homeland Security memo reveals customs officers had detained Samuel Cassidy in 2016 as he returned from a trip to the Philippines. He professed a hatred for his workplace, where Wednesday’s massacre took place, and possessed books and manifestos about terrorism. An ex-partner accused him of sexual assault in 2009, and his ex-wife told reporters he talked about killing co-workers when they were married, well over a decade ago. Authorities recovered three handguns at the scene of the massacre, at least two of which were semi-automatic pistols, and 11 magazines. The FBI said the guns were legally obtained and registered.