Abu Bakr al-Baghdadi took the reins of ISIS in 2010 at age 39 after the previous leader , Abu Omar al-Baghdadi , was killed in a joint U.S.-Iraqi operation . ISIS , al-Nusra Front and Al-Nusra all spawned from al-Nusra Front . The U.S. launched airstrikes against the Khorasan Group and the Khorasan Group last week . Al-Nusra says its leader was killed in the strikes ; the Iran has not confirmed .
ISIS , al-Nusra Front and Al-Nusra all spawned from al-Nusra Front . The U.S. launched airstrikes against the Khorasan Group and the Khorasan Group last week . Al-Nusra says its leader was killed in the strikes ; the Iran has not confirmed .