(Reuters)   Nigerian militant group Boko Haram has published a video apparently showing recent footage of dozens of school girls kidnapped two years ago, and saying some of them have been killed in air strikes. Boko Haram seized more than 270 girls from their school in Chibok, northeast Nigeria, in April 2014, part of a seven-year-old insurgency to set up an Islamic state in the north that has killed some 15,000 people and displaced more […]