Syrian rebels have posted a Youtube video that they say is of the launch of a missile carrying a chemical warhead toward Ghota al-Sharkiya – the neighborhood of Damascus where hundreds were killed in a poison gas attack 10 days ago.

The video shows soldiers milling about next to a military truck as the missile on the truck's bed is positioned for launch. The missile is then fired and the truck is covered with tarpaulin.

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The rebels say that the characteristics of the missile are very similar to those of the missile remains that were found in Ghota al-Sharkiya.

United States Vice President Joe Biden said Tuesday that there is "no doubt" that Syrian President Bashar Al-Assad was responsible for the August 21 chemical weapons attack near Damascus.

"We know that the Syrian regime are the only ones who have the weapons, have used chemical weapons multiple times in the past, have the means of delivering those weapons, have been determined to wipe out exactly the places that were attacked by chemical weapons," Biden said.