The official position is that the US has refused to allow heavy weapons into Syria.

But there’s growing evidence that U.S. agents—particularly murdered ambassador Chris Stevens—were at least aware of heavy weapons moving from Libya to 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 disbanded, with some fighters reportedly participating in the attack that took Stevens’ life.

Read more at BusinessInsider.com