BELFAST, Northern Ireland - Belfast's most infamous militant stormed into the Northern Ireland Assembly headquarters Friday with a bagful of pipe bombs, forcing an evacuation that overshadowed the politicians' failure to meet a deadline for forming a new Catholic-Protestant administration. Two security guards trapped Michael Stone — an icon of Protestant extremism because of his grenade-and-gun attack on an Irish Republican Army funeral in 1988 — halfway inside the brass revolving door of Stormont Parliamentary Building. Stone, a long-feared figure who boasts of his desire to kill Sinn Fein leaders, repeatedly screamed "No surrender!" as one guard twisted Stone's arm...