WATERTOWN, Mass. (AP) - One of two suspects in the Boston Marathon bombing is dead after the killing of a university officer and a shootout with police, and a massive manhunt is underway for the other, authorities said early Friday. Police are locking down some neighborhoods in Boston and its western suburbs as they search for the remaining suspect: known as the man in the white hat from marathon surveillance footage. Authorities urged residents in Watertown, Newton, Waltham, Belmont, Cambridge and the Allston-Brighton neighborhoods of Boston to stay indoors. All mass transit was shut down and businesses were asked not...