GOMBE, NIGERIA - FEBRUARY 01: Smoke rises following a suicide attack carried out at a marketplace in Gombe, Nigeria on February 1, 2015. (Photo by Stringer/Anadolu Agency/Getty Images)
GOMBE, NIGERIA - FEBRUARY 01: Smoke rises following a suicide attack carried out at a marketplace in Gombe, Nigeria on February 1, 2015. (Photo by Stringer/Anadolu Agency/Getty Images)