Overview: The fourth in a series on the crisis in Libya with reports from CNN's Ben Wedeman, Ivan Watson and Anderson Cooper. Other guests include Reza Aslan (author of No God But God), Mohamed El-Erian (CEO of the world's largest bond fund manager, Pacific Investment Management Company (PIMCO)), Commissioner Ray Kelly, New York Police. Actress Sharon Stone is interviewed. Piers Morgan Tonight's Special Royal Correspondent, Katie Nicholl, reports on the wedding of Prince William and Kate Middleton.