Muhsin al-Fadhli was the alleged leader of Khorasan, an offshoot of the al-Nusra Front, a branch of al-Qaeda.

According to media reports, al-Fadhli was a close confidant of Osama bin Laden, and was one of the few people to be informed of the September 11 attacks before they were launched.[4] He was born in Kuwait and uses the aliases Muhsin Fadhil ‘Ayyid al Fadhli, Muhsin Fadil Ayid Ashur al Fadhli, Abu Majid Samiyah, and Abu Samia.

In 2012, the United States State Department identified al-Fadhli as the leader of al-Qaeda in Iran.

In mid-2013, al-Fadhli was sent to Syria on behalf of al-Qaeda emir Ayman al-Zawahiri, in order to mediate disputes between al-Qaeda's then Iraqi branch, the Islamic State of Iraq and the Levant (ISIL) and the al-Nusra Front.

In February 2014, al-Fadhli was instrumental in influencing al-Qaeda to disassociate itself from ISIS

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July 21, 2015 Key al-Qaeda figure Muhsin al-Fadhli, the leader of the so-called Khorasan Group which is made up of senior al-Qaeda members, has been killed in a U.S. airstrike in northwestern Syria, the Reuters news agency is reporting, citing the U.S. military.