Eighty-seven people were killed and 114 wounded at an open-air market in Islamabad yesterday in one of the worst ruckuses to hit the Pakistani capital in years. Witnesses said that the bloody to-do occurred shortly before noontime prayers, and that dozens were instantly killed by the doozy of a shockwave. Many more were reportedly trampled to death in the rush to escape the foofaraw. 'It was as though some invisible hand had come through to wipe out all that was good and human,' onlooker Taufiq Jinnah said. 'There was so much death and carnagehow could God let such a brouhaha happen?' The Pakistani government, which promised a major counter-hubbub against those responsible, would not rule out a small-scale nuclear donnybrook. 