ABUJA, NIGERIA - MAY 22:  A Police officer stand guards during a demonstration that Nigerians demand release of Nigerian school girls who were kidnapped by extremist militants Boko Haram in capital Abuja, Nigeria on May 22, 2014. The protesters called for the safe return of the girls and for the Nigerian government to play a more active role in helping to return the girls to their families. (Photo by Nacer Talel/Anadolu Agency/Getty Images)