Even as offshoot kills 2 Syrian rebel leaders
                                
                                
                                    (Newser) -
                                    The Islamic State of Iraq and Syria is "not a branch of al-Qaeda," Ayman al-Zawahiri declared in a statement posted online yesterday. "Al-Qaeda is not responsible for ISIS' actions," and has "no connection" to it, al-Qaeda General Command said, according to the  BBC . It added...