The bloody standoff at a Nairobi shopping mall has ended its fourth day. Kenya’s government claims its forces have gained control of the upscale shopping center where militants representing the terrorist group al-Shabaab were holding hostages. But weapons fire and bomb blasts continue to be heard from the mall and the attackers have Tweeted that they are still resisting government forces. Speculation is growing about the identity of the militants and how they pulled off a such a brazen assault. While al-Shabaab is a Somali militia, it appears operatives inside the mall were a multinational group, possibly including Americans. Guest host Katty Kay and her guests discuss international terrorism and implications for security at home.