HAVANA, Cuba (AP) -- Hundreds of thousands of Cubans answered Fidel Castro's call to file past the American mission early Tuesday in a "March against Terrorism," demanding that the United States arrest a Cuban militant in the deadly bombing of an airliner. Dressed in his traditional olive green military uniform and cap, the 78-year-old Castro showed up in the crowd outside the U.S. Interests Section minutes before the march was to start. "Down with terrorism!" Castro shouted in brief comments before he stepped off to lead the march. "Down with Nazi doctrines and methods! Down with the lies!" Marchers began...