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Newly-released video footage shows militants in Syria using anti-aircraft fire to shoot at, what appears to be, a passenger plane.

In the video, circulated on the Internet on Thursday, a militant is heard saying in Arabic, "It's a mistake. That's a passenger plane."

"No, it's a warplane," another one says.

A third militant is heard saying, "Even if it's a passenger plane, Sheikh Ahmad says shoot it down."

The militants then fire at the plane, but it is not clear whether the aircraft is actually downed.

The whereabouts of the incident is not clear from the video.

Earlier in the day, more than four people were killed and tens of others injured in a car bombing carried out near Damascus.

Syria has been experiencing unrest since March 2011. The Syrian government says the chaos is being orchestrated from outside the country, and there are reports that a very large number of militants are foreign nationals.