The official position is that the US has not sent any heavy weapons to Syrian rebels—despite reports that weapons sent to Saudi Arabia and Qatar are ending up in the hands of jihadist Syrian rebels.

But there’s growing evidence that US agents in Libya were at least aware of weapons and militants moving across the border. Some—like anti-Islamic think tank Radical Islam— have suggested that US agents encouraged this trade.

Particularly worrying are the ties between murdered U.S. Ambassador Chris Stevens and jihadist Syrian rebels.

In March 2011 Stevens became the official U.S. liaison to the al-Qaeda-linked Libyan opposition, working directly with Abdelhakim Belhadj of the Libyan Islamic Fighting Group—a group that has now dispanded, with some fighters reportedly participating in the attack that took Stevens’ life.

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