CLINTON . . . THREATS

David Shane Shelby, 29, was arrested in Ogden, Utah, as he tried to mail a package containing a bomb to President Clinton, and another with a pistol to cult murderer Charles Manson. Authorities had issued a warrant for Shelby's arrest after he allegedly sent President Clinton and Vice President Al Gore letters on Dec. 7 threatening to kill them. The bomb intended for Clinton contained a light bulb filled with explosives, designed to go off when it was used, The Salt Lake Tribune reported, citing an anonymous police officer.In a second incident, police wrestled down William C. Phillips, also 29, after spotting him Wednesday night in Trexlertown, Pa., standing with a handgun along Clinton's motorcade route. He was committed to Allentown State Hospital for a psychiatric examination, state police said.