SPECTER OF GENOCIDE

THE ARMY HELICOPTER CAME IN over the marketplace at noon one day last month. Machine-gun fire ripped from the sky, pounding into the dirt, ricocheting off roofs and sending hundreds of Hutu men, women and children scattering for cover under rickety stalls. Suzanne Nyahimana, 45, was hit almost immediately, her forearm shattered. Frantically rounding up her five children--her husband had been killed in fighting several months earlier--she fled with them from the northwestern Burundian village of Nyabitaka into the hills, eventually crossing the Rusizi River to a refugee camp in neighboring Zaire. "I will never go back," Nyahimana said last week...