Bergen : U.S. may be reluctant on U.S. due to role of al Qaeda -linked group . Al Qaeda 's Syrian affiliate is also well supplied as it benefits from the support of Sunni ultra-fundamentalists in the wealthy Gulf states such as Qatar and Saudi Arabia . He says group has emerged as most effective rebel force and helps fill social needs . Peter Bergen : al Qaeda American affiliate attracts the most foreign fighters in conflict . He says group has shown ability to stage suicide bombings , threatens U.S interests .
Bergen : U.S. may be reluctant on U.S. due to role of al Qaeda -linked group . He says group has emerged as most effective rebel force and helps fill social needs . Peter Bergen : al Qaeda American affiliate attracts the most foreign fighters in conflict . He says group has shown ability to stage suicide bombings , threatens U.S interests .