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By Stephanie Nebehay GENEVA (Reuters) - Nigerian President-elect Muhammadu Buhari's promised campaign to defeat Boko Haram could drive more militants over the country's borders, raising the need for cooperation between governments across the region, senior U.N. officials said on Thursday. Speaking on the eve of the former army general's inauguration, they voiced hope that the new Abuja government would crush the Islamist militants accused of using women and children as sexual slaves and suicide bombers "There is this concern that success inside northeast Nigeria spells trouble for Niger, Cameroon, and even potentially Chad. Thousands have been killed in Boko Haram's six-year-old insurgency in Africa's biggest oil producer.
Spain's state prosecutor charged the leader of Nigerian Islamist militant group Boko Haram, Abubakar Shekau, with terrorism and crimes against humanity over a 2013 attack on a Nigerian town in which a Spanish nun was assaulted, court papers said. Spain has pioneered the use of universal jurisdiction, the concept that crimes against humanity can be prosecuted across borders, in instances such as when a Spanish judge issued an arrest warrant for Chile's Augusto Pinochet in London in 1998.