A man from Florida has been taken into custody following an FBI probe that connected him to several extremist group conversations on the encrypted messaging platform, Signal. The authorities allege that he used pseudonyms to circulate alarming graphic content, detailed bomb-making instructions, and extremist neo-Nazi propaganda.

Lucas Alexander Temple, aged 20, is now facing federal charges related to spreading information about the production or use of explosives and possessing an unregistered short-barreled shotgun, as outlined in court records.

Documents from the criminal case indicate that Temple distributed a hand-drawn sketch of a homemade detonator, provided links to YouTube tutorials on how to create dynamite and design blasting caps, and shared a 122-page extremist handbook filled with White supremacist ideology.

Authorities reported that these group chats contained graphic discussions advocating for rape, torture, and murder, including the killing of non-White children.

Allegedly, neo-Nazi propaganda was discovered at Temple’s residence, along with a driver’s license photo of him.

Screenshots of messages allegedly sent by Temple’s aliases included phrases like, “How long would it take to rape a femboy to death?” and discussions about sexually assaulting men.

Temple’s online aliases were linked to his true identity through personal details shared in chats — including his age, job at a grocery store and a family museum visit — and were verified with state records and security footage, according to the complaint.

While executing a search warrant at Temple’s home on Thursday, FBI agents found neo-Nazi propaganda, a book related to Columbine High School shooters Dylan Klebold and Eric Harris and a Springfield Model 67 Series E shotgun with a barrel shorter than 18 inches.

The barrel was allegedly sawed off and found in a separate area by investigators.

Guns were found inside Temple’s bedroom, according to authorities.

ATF records confirmed Temple was not registered to have the weapon.

Agents also found a handwritten note that said, “Plans: Wear body cams for livestream. Notify friends of livestream. Put flags on car. Play music on car speakers during operation. Place motion-activated bombs in doorways (for cops).”

A handwritten attack plan was found inside Lucas Temple’s bedroom, according to authorities.

During his initial court appearance, Magistrate Judge Amanda Arnold Sansone ordered that he remain detained pending trial, finding he posed a serious danger to others.