BOSTON (AP) - An argument at an after-hours party erupted in gunfire, killing a woman and prompting the mayor to call for an end to the late-night parties. Chiara Levin, 22, was shot in the head and pronounced dead about 4 a.m. Saturday, police said. No arrests had been made as of Monday. Levin, who grew up in Kentucky and had recently moved to New York City, was at a downtown bar Saturday night with two male friends where they met another group of three men around last call, authorities said Monday. The three men, all from Boston, took Levin...