An all-night siege in an upscale neighborhood of Afghanistan's capital ended in the early hours of Wednesday morning with the deaths of four heavily armed Taliban attackers, though no civilians or security personnel were injured or killed. The siege ended after 5 a.m. in a sustained barrage of automatic weapons fire and a series of huge explosions that resounded across the Wazir Akbar Khan district of downtown Kabul, home to many embassies and foreign firms.