It is silly that western mainstream media simply quotes the Qatari Emirs denial of his country being a sponsor of Salafi/Takfiri terrorists. Contrary to pro-Russian or at least „not pro-american“ countries Qatar (and likewise Saudi Arabia, Bahrain, Kuwait..) has a lobby. After all „Qatar is the richest country in the world per capita – and has made significant investments“ into various western countries and corporations.

The following article and the embedded video clip shed more light on Qatars role in devastating Syria (and earlier Libya) through arming and funding radical Islamists:
http://www.telegraph.co.uk/news/worldnews/middleeast/qatar/11171847/How-Qatar-funds-extremists-across-the-Middle-East.html

The article explicitly mentions Ahrar al Sham. Some western and (Gulf) arab media have attempted to portray Ahrar al Sham as a kind of „acceptable“ – though not explicitly „moderate“ – rebel faction. The focus of such coverage has been to emphasize Ahrar al Shams fighting against IS(IS).  Simultaneously the same sources try to either  downplay Ahrars connection to and regular cooperation with Al Qaedas Syrian branch, the Salafi Al Nusra Front or to create the impression that Al Nusra is the arch enemy of IS(IS) and thus „automatically“ good or worthy of support.
Hence, it may be necessary to once again make absolutely clear that Al Nusra are radically sectarian takfiri Jihadists and 100% non-moderate.
„Islamist rebels decapitated prisoners around the United Nations bases near where Irish troops were serving in Syria, a UN report seen by the Sunday Independent reveals.“
The article makes clear that the beheaders were Al Nusra fighters:
http://www.independent.ie/irish-news/news/alqaeda-rebels-dangled-victims-heads-to-goad-un-30638839.html

It is very embarassing for Saudi Arabia, Qatar and Turkey as the main funders, trainers, weapons providers and facilitators of the Syrian insurgent factions as well as for the US administration that continues to stick to the myth of „moderate“ rebels that the Nusra Front increasingly and openly voices sympathy and support for IS (with which it cooperates already in Lebanon during kidnapping and beheading „joint ventures“):
http://edition.cnn.com/2014/10/06/world/meast/isis-al-nusra-syria/index.html?hpt=imi_r1

More complications for the „standing“ and reliability of the insurgents arise from the Nusra being a major factor on almost all of Syrias frontlines and cooperating with all relevant rebel factions, among them the „Islamic Front“ (where the Ahrar are the biggest single group), the „Syrian revolutionaries front“ and the „Southern Front“.

For more details on Syrias different rebel factions and the radical islamist ties of all of them, see
https://radioyaran.com/2014/09/11/the-vetted-moderate-rebels-of-the-free-syrian-army-who-and-where-are-they/