Two recent news stories give some information on foreign fighters in Syria fighting for Jabhat an-Nusra (linked with al-Qaeda):
"American passport found at al Qaeda base in northern Syria" -
http://www.longwarjournal.org/archives/2013/07/american_passport_fo.php
and a story from CNNTurk (in Turkish) on the discovery of three Turkish ID documents at the same base
http://www.cnnturk.com/2013/guncel/...asinin.oldugu.one.suruldu/715987.0/index.html
According to the story the IDs were found on dead Jabhat an-Nusra fighters in the town of Ras al-Ayn; one of the dead had previously been arrested in Turkey for links with al-Qaeda.
"American passport found at al Qaeda base in northern Syria" -
http://www.longwarjournal.org/archives/2013/07/american_passport_fo.php
and a story from CNNTurk (in Turkish) on the discovery of three Turkish ID documents at the same base
http://www.cnnturk.com/2013/guncel/...asinin.oldugu.one.suruldu/715987.0/index.html
According to the story the IDs were found on dead Jabhat an-Nusra fighters in the town of Ras al-Ayn; one of the dead had previously been arrested in Turkey for links with al-Qaeda.