Video purportedly showing Hezbollah militants executing Syrian rebels. Photo: Screen shot.

A video purporting to show Hezbollah militants executing captive Syrian rebels is making the rounds on the internet, and could revive tensions in Lebanon between the Shiite Hezbollah and Sunni Islamists supporting the Syrian uprising, Al Arabiya reported Thursday.

The video dates to June and the battle over the strategic town of Qusayr. The fight was noteworthy for several reasons, particularly because it was the first time Hezbollah publicly recognized its involvement in the Syrian civil war.

The video, which runs 1 minute and 36 seconds, shows several men dressed in camouflage pulling what appear to be several wounded men in civilian clothing out of a van; they then execute them.

Watch the video of the executions here.