A 21-year-old loner from Armstrong County had an arsenal in his bedroom, a radical Islamist online persona and videos suggesting paramilitary training before his arrest last week for biting two FBI agents, federal prosecutors charged in court Thursday. As a result, Emerson W. Begolly will remain in jail pending trial, U.S. District Judge Maurice B. Cohill decided, over the strenuous objections of a defense attorney who said his client was nonviolent. A magistrate judge's decision last week to ship him to a halfway house, which was stayed during its appeal, was shelved. Mr. Begolly "has a strong desire to kill...