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TO GO WITH AFP STORY BY PHIL HAZLEWOOD A soldier of the 7th Division of the Nigerian Army stands infront of the remaining dilapidated buildings of the Government Girls Secondary School Chibok in Borno State north-eastern Nigeria on March 25, 2016. There's not much left of the Government Girls Secondary School in Chibok, northeast Nigeria, where Boko Haram kidnapped 276 teenagers in the dead of night nearly two years ago. Even the word "girls" on the school sign outside has been painted over in black -- hidden from the world, just like the 219 students who are still missing. / AFP / STEFAN HEUNIS / TO GO WITH AFP STORY BY PHIL HAZLEWOOD (Photo credit should read STEFAN HEUNIS/AFP/Getty Images)

TO GO WITH AFP STORY BY PHIL HAZLEWOOD A soldier of the 7th Division of the Nigerian Army stands infront of the remaining dilapidated buildings of the Government Girls Secondary School Chibok in Borno State north-eastern Nigeria on March 25, 2016. There's not much left of the Government Girls Secondary School in Chibok, northeast Nigeria, where Boko Haram kidnapped 276 teenagers in the dead of night nearly two years ago. Even the word "girls" on the school sign outside has been painted over in black -- hidden from the world, just like the 219 students who are still missing. / AFP / STEFAN HEUNIS / TO GO WITH AFP STORY BY PHIL HAZLEWOOD (Photo credit should read STEFAN HEUNIS/AFP/Getty Images)
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AFP STEFAN HEUNIS