attack. the terror group isis-k claiming responsibility. so, who are they? they claim to be a branch of isis. the k stands for khorasan. an area around the afghan- afghan-pakistan border and into parts of iran, as well, and other parts of south asia. their goal is to create an islamic caliphate across afghanistan and beyond into some of those countries. along with being a rival and enemy of the taliban, they seek to target western organizations, civilians, and anyone who doesn't meet their severe interpretation of islam. they have already have an extensive record of murderous atrocities. for more, cnn's jomana karadsheh joins me now from istanbul. she's extensively covered the rise and fall of isis in iraq and elsewhere. so, jomana, good to see you. isis-k, an off-chute of isis proper, what more can you tell us about the group? the aims? the capabilities? >> well, michael, as you mention