The looters tore off the plywood that boarded up Macy’s flagship store in Herald Square, swarming by the dozens inside to steal whatever they could find before being chased down by the police. Others smashed the windows at a Nike store, grabbing shirts, jeans and zip-up jackets. They crashed into a Coach store,ransacked a Bergdorf Goodman branch and destroyed scores of smaller storefronts along the way. The eruption of looting in the central business district of Manhattan — long an emblem of the New York’s stature and prowess — struck yet another blow to a city reeling from the nation’s...