ORANGE PARK, Fla. (AP) — Law enforcement authorities say a Florida man posed online as an Australia resident and tried to help plan an attack on a 9/11 memorial in Missouri by providing details on how to build a bomb with a pressure cooker and rat poison.The U.S. Attorney's Office said Thursday that 20-year-old Joshua Ryne Goldberg of Orange Park was arrested and charged with distributing information relating to explosives, destructive devices and weapons of mass destruction. A criminal complaint says Goldberg began communicating online with an FBI informant in July. The document says Goldberg instructed the agent to place the bomb at a memorial in Kansas City, Missouri. Australian Federal Police say a witness reports that Goldberg's online personas were part of a hoax and that he was actually a "proponent of radical free speech." They also say Goldberg will face additional charges there.