The 'inside job'

"... Idilbi said the meeting of so many key leaders apparently had been called to consider whether Ahrar al Sham should join a new rebel coalition, the Council for Leading the Revolution, that would unite moderate rebels, including those receiving U.S. aid. The decision to join the coalition, whose formation was announced hours after the explosion, would have been a major change for the group, whose ties to the Nusra Front were so close that some U.S. intelligence officials have advocated that Ahrar al Sham be classified as an international terrorist organization.The explosion was likely to prove fatal to the organization, which was once thought to have had as many as 35,000 fighters...."