A "radical" and former UK-based militant, Moazzam Begg, has a column on foreign fighters (subject of a thread) and within is this passage:
One of the leaders of Ahrar al-Sham is Abu Khalid al-Suri, an associate of mujahideen ideologue Mustafa Setmariam Nasser (aka Abu Musab al-Suri) who was arrested by Pakistani forces in 2005 and handed over to US authorities as part of the War on Terror. Through the US rendition programme Abu Musab al-Suri was sent to the Asad regime. Both men remained in Syrian custody until the former was released in 2011 while the latter’s whereabouts remained a mystery.
Link:http://www.cageprisoners.com/our-wor...-war-on-terror