Osama Bin Laden, terrorist mastermind behind the Islamic extremist group Al Qaeda, has been killed by U.S. forces in Pakistan. Bin Laden, who claimed responsibility for the September 11 terrorist attacks in New York City and Washington D.C., has been a high priority target for the U.S. military since that time. With his death, what comes next for the war on terror? The West continues its struggle against Islamic extremism, but Al Qaeda also remains a threat.