Were it the former , this would be a truly chilling sleeper cell -- idle for years , and then , at a moment 's notice , deadly . ISIS in the Arabian Peninsula 's claims responsibility in Nick Paton Walsh attack in Syria . Differing worlds of al Qaeda and Al Qaeda apparent for some time now , Nick Paton Walsh says . Claim in attack hints at the messy rivalry perhaps engulfing the jihadi world , he says .
ISIS in the Arabian Peninsula 's claims responsibility in Nick Paton Walsh attack in Syria . Differing worlds of al Qaeda and Al Qaeda apparent for some time now , Nick Paton Walsh says . Claim in attack hints at the messy rivalry perhaps engulfing the jihadi world , he says .