Who are the rebels in Syria?

Syrian rebels hunt for snipers after attacking the municipality building in the city center of Selehattin, near Aleppo, on July 23, 2012, during fights between rebels and Syrian troops. Syrian rebels "liberated" several districts of the northern city of Aleppo on Monday, a Free Syrian Army spokesman in the country's commercial hub said.  AFP PHOTO / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/GettyImages)

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    Who are the rebels in Syria?

Analyst suggests that extremists who fought in Iraq are now gaining ground in Syria.