Md. “Joker” Arrested In Workplace Shooting Plot [VIDEO]

Police say a Maryland man calling himself "a joker" threatened to shoot up the business from which he was about to be fired and was wearing a T-shirt that read "Guns don't kill people. I do," when he first talked to officers who arrested him.

An official with knowledge of the investigation says Neil Prescott phoned in the threat to software and mailroom supplier Pitney Bowes near Washington, D.C. The official spoke on condition of anonymity because the investigation is unfolding, and police would not confirm the suspect's name.

At a news conference today, Prince George's County Police Chief Mark Magaw said the suspect is accused of saying on the phone to Pitney Bowes "I am a joker and I'm gonna load my guns and blow everybody up."

Investigators say a search of the 28-year-old man's apartment in Crofton, Md., turned up some 25 firearms, including semi-automatic rifles and pistols, and several thousand rounds of ammunition. Police say they were surprised by the number of weapons they found.

The suspect is undergoing an emergency mental health evaluation and charges are pending.

Officials say the man made several threats on separate phone calls earlier this week.