A jagged 15-foot-wide hole blown into a concrete bridge in this heavily militarized city, the tightly guarded headquarters of Pakistan’s Army, is the latest example of why this country is so unsettling to American policy makers. Last Sunday night, a powerful bomb here came within seconds of killing the military ruler of Pakistan, an impoverished, nuclear-armed country that sits near the epicenter of the American-led campaign against terrorism. Who would have succeeded the president, Gen. Pervez Musharraf, and taken control of the country’s dozens of nuclear bombs is unclear. Full Story