BAUCHI, Nigeria, April 8 (Reuters) - Gunmen abducted at least 80 people, mostly women and children, in Nigeria's Zamfara state, a hotspot for kidnappings for ransom by armed gangs targeting remote villages, residents said on Saturday. Musa Usman, whose 14-year-old son Ibrahim was among those abducted, said children and women from the village were clearing land for farming and collecting firewood when they were taken by gunmen and marched into a nearby forest. See here for a complete list of exchanges and delays