(NBC) -- Maryland police have a man in custody for allegedly making threats against his employer, including one where he called himself a "Joker" willing to load his guns and blow everyone up.
Police arrested 28-year-old Neil Prescott at his Crofton, Maryland home after complaints from his employer about several threatening phone calls.
One in particular included an apparent reference to the shooting last week in Aurora, Colorado.
Police say Prescott was wearing a T-shirt that said "Guns Don't Kill People, I Do" when arrested.
A search of his home netted what they call an "arsenal" of weapons including two dozen rifles and handguns.
Reports say Prescott worked for a Pitney Bowes subcontractor and has not been on company property in more than four months.
Authorities think they've foiled yet another violent event.
Prescott is undergoing psychological evaluation at a medical center in Annapolis while authorities figure out what charges he'll face.