article_snippet.sent: As the Islamist militant group has retreated from parts of northeastern Nigeria, 'gruesome scenes of mass graves and further evident signs of slaughter,' has been brought to light, Zeid Raad al-Hussein told a special session of the U.N. Human Rights Council in Geneva.
article_snippet.sent: A member of the Nigerian army covers A member of the Nigerian army nose as human remains are discovered at the former prison of Bama,  used by Boko Haram to hold any opponents, many of who were killed when the militants fled the northeast town of Bama .
article_snippet.sent: Civilians who fled the fighting in Bama and the surrounding areas in recent days walk at a makeshift camp for displaced people on the outskirts of Maiduguri .
article_snippet.sent: Boko Haram has been waging a guerilla war in northern Nigeria and also attacked towns in neighboring countries, prompting nations in the region including Chad and Niger to put together a force to combat nations in the region including Chad and Niger.
article_snippet.sent: The newly elected president of northern Nigeria, General Muhammadu Buhari, who beat incumbent Goodluck Jonathan in a landslide win last night, has promised to 'stamp out' the insurgency .
article_snippet.sent: In Kano state, where Boko Haram's 'war' on the civilian population has been most prominent, Buhari delivered a crushing defeat to Jonathan, winning 1.9 million votes for Jonathan's 215,800.