KABUL, AFGHANISTAN - MAY 17: US and afghan security forces inspect the site of a suicide attack in Kabul on May 17, 2015. At least three people, including a foreign national, were killed and 20 others were wounded after a suicide bomber detonated his explosives near the military wing of Kabul International Airport on Sunday, Afghani police said. (Photo by Haroon Sabawoon/Anadolu Agency/Getty Images)