Turkey faces daunting two-front terror threat

What's behind the latest deadly rampage in Turkey, one in a string of terror attacks there in the past year? William Brangham speaks with Bulent Aliriza from the Center for Strategic and International Studies about the two-front attack facing Turkey and how President Recep Tayyip Erdogan’s purge of government officers following the summer’s coup is affecting his country’s efforts to fight terror.