The poor-quality videos show men standing around an artillery vehicle, wearing what appear to be gas masks, with the cannon's barrel draped in large black flags bearing Islamic symbols and the name of rebel group Liwa al-Islam. In one video, a man mentions the group and - after one blast - the men chant "Allahu Akbar", or "God is great". Liwa al-Islam eventually released a statement declaring the videos to be "completely fabricated" and blaming the Assad government which, it says, is the only force in Syria in possession of the weapons shown in the video. But only after several days of examination by bloggers.