Prince George's County State's Attorney Angela Alsobrooks says the charge is punishable by up to three years in prison. The charges against Neil E. Prescott were announced at a news conference Wednesday in Upper Marlboro.
The 28-year-old Crofton man was taken into custody last Friday after the threats were reported to police. He has been receiving an emergency psychiatric evaluation at a hospital. Police say they found ammunition and about two dozen weapons, including semi-automatic rifles and pistols, in his apartment.
The "joker" comment prompted concern because of a mass shooting a week earlier at a Colorado movie theater screening the latest Batman movie.
