NEWYou can now listen to Fox News articles! A Florida man was arrested after an FBI investigation linked him to multiple extremist group chats on the encrypted messaging app Signal, where agents claim he used aliases to share disturbing graphic messages, detailed instructions for explosives and violent neo-Nazi propaganda. Lucas Alexander Temple, 20, is facing federal charges for distribution of information regarding the manufacturing or use of explosives, and possession of an unregistered short-barreled shotgun, according to court documents. According to criminal complaints, Temple shared a hand-drawn diagram of a homemade detonator, linked to YouTube videos describing how to synthesize...