Al-Qeda leader Osama Bin Laden was killed by the US forces on Monday, leaving the top job vacant. Terrorism experts across the world are offering their predictions as to who will take over the terrorist outfit's top job. Bin Laden's adviser and second-in-command, Ayman al-Zawahiri, is considered the most likely successor. Here is a list of a few members who are in the race to succeed Bin Laden.