The Islamic State is claiming credit for an attack in London which left seven people dead and at least 48 injured. On Saturday night, assailants plowed over pedestrians with a van on London Bridge and then went on a stabbing rampage at a nearby market. Police shot and killed the attackers, who wore what turned out to be fake suicide vests. The incident comes less than two weeks after a deadly bombing at a concert in Manchester. We'll talk with New Yorker journalist and terrorism expert Robin Wright about the attack.