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FBI Arrests Weapon-Hoarding Teen

​​​​The FBI arrested an 18-year-old from Ohio for allegedly making online threats, including some against the U.S. federal government, and found an enormous cache of weapons in the house where the young man was living, authorities said, via NBC News.

When agents raided the Boardman, Ohio, house where Justin Olsen was living, they recovered 15 rifles, 10 semi-automatic pistols, and roughly 10,000 rounds of ammunition, according to a criminal complaint written by an FBI Special Agent and seen by NBC News.

Olsen, who wrote online under the name "ArmyOfChrist," was charged Monday with one count of threatening to assault a federal law enforcement officer. Besides threatening federal government and federal agents, he also threatened to target and assault Planned Parenthood, and wrpte that he supported mass shootings, NBC reports.

Local authorities decided they had to act swiftly on the threats in the wake of the recent mass shootings in El Paso, Texas, and Dayton, Ohio, NBC affiliate WFMJ reports.

According to authorities, the case against Olsen began earlier this year when FBI agents in Anchorage, Alaska, working in a chat room called iFunny, found a user named ArmyOfChrist making threatening comments. That user wrote online that he supported the Oklahoma City bombing in 1995 and the shootings of ATF agents at the siege of the Branch Davidians compound in Waco, Texas, in 1993.

Agents raided Olsen's place of residence, described in the complaint as his father's home, on 7 August and found a large number of guns and bullets throughout the house and in a gun vault in Olsen's room.

For more on recent FBI terrorism arrests, see last month’s Today in Security article on the subject.  ​