it lost most of its hold on somalia, including mogadishu, and the key port of kismayo, by a campaign launched by african union troops. the attack on the mall was the worst terrorist attack in nairobi since the embassy bombing in 1998, killing more than 200. president obama telephoned kenya's president, uhuru kenyetta. confirming their partnership. >> many of us lost loved ones. >> the president revealing his nephew and his partner were killed. >> let's mourn them as one nation, keeping them in our memory and prayer. >> joining me now from washington d.c. is ambassador david shipp, the former top american diplomat in ethiopia, and a professor at washington university, and richard miniter, a terrorism expert and author. >> kenya's military played a major roll forcing al-shabab's fighters out of the somalian cities. given that, does it come as a surprise they were strong enough to pull off the westgate mall nightmare? >> it does not come as a surprise. the surprise is it did not happen earlier. >> al-shabab has been threatening to pull off a major strike like this for the last two years