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Prince George's County, Md. Police Chief Mark Magaw answers questions at the Prince George's County Police Headquarters in Palmer Park, Md., Friday, July 27, 2012, after a news conference to discuss a suspect who police say was plotting a shooting in his workplace. A Maryland man calling himself "a joker" is accused of threatening 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, police said Friday. (AP Photo/Jacquelyn Martin)

Maryland massacre plot foiled by police

A Maryland man accused of threatening to shoot up his workplace and who police say called himself "a joker" was described by a friend as a "gentle giant" who collected firearms for target practice and had expressed concerns about someone breaking into his apartment.