By Peter Bergen
Editor's note: Peter Bergen is CNN's national security analyst, a director at the New America Foundation and the author of "Manhunt: The Ten-Year Search for bin Laden - From 9/11 to Abbottabad."
When even al Qaeda publicly rejects you because you are too brutal, it's likely a reasonable indicator that you are.
A long simmering dispute between "al Qaeda Central," headed by Ayman al-Zawahiri, and the most brutal al Qaeda affiliate in Syria, generally known as the Islamic State of Iraq and Syria, surfaced publicly on Monday.
On jihadist websites, al Qaeda's central leadership posted a notice saying ISIS "is not a branch of the al Qaeda group."
It is the first time in its quarter century history that al Qaeda has officially rejected one of its affiliates.FULL STORY