fighters killed in this strike came from the afghans. the u.s. military is not confirming that. they're still saying they know there was a large contingent of isis fighters hit, but they don't have any specificity on numbers. the bomb itself was a 21,000 pound gbu-43. yesterday when we first heard about this, everyone was asking this question, why did they need to use such an enormous bomb? the answer is the target itself. it was a complex, an isis complex with a relatively extensive tunnel system underneath. this gbu-43 is not only an enormous payload, but it's a blast munition. so it hits the target, and then it sends out a shockwave or a blast wave that would have penetrated down into the tunnels, and taken out any isis fighters who might have been inside there. the target itself was in eastern afghanistan.