FILE - In this Saturday, March 17, 2012 file photo, Syrian security officers gather in front the damaged building of the aviation intelligence department, which was attacked by one of t

 

              FILE - In this Saturday, March 17, 2012 file photo, Syrian security officers gather in front the damaged building of the aviation intelligence department, which was attacked by one of t
FILE - In this Saturday, March 17, 2012 file photo, Syrian security officers gather in front the damaged building of the aviation intelligence department, which was attacked by one of two explosions in Damascus, Syria. A new al-Qaida-style group claimed Wednesday, March 21, 2012 that it carried out the double suicide bombing that killed dozens. Foreign Islamic militants fighting Syria's regime pose a dilemma for the country's rebels, and nothing typifies the problem more than Jabhat al-Nusra, a shadowy group of veterans of jihad in Iraq, Libya and elsewhere. Some rebels worry the group is too radical, using al-Qaida-style tactics of suicide bombings. (AP Photo/Bassem Tellawi, File)