What looks like a mobile phone video was posted on youtube and subsequently released by the police on thursday. On friday a 14 year old boy was arrested. He has now been bailed to return in march.

The police are now trying to track down the person who originally posted the video. It appears the met are still unsure what happened after the video, which ends with a protester running into the distance with the alleged petrol bomb in hand. There appears no proof that any petrol bomb was thrown or even existed.

There are clearly here two solid reasons why you don't post stuff like this on youtube. Firstly, the pigs are watching - whoever posted this video is risking the life and liberty of a fellow protester. Secondly and far less importantly, although I hope it scares people out of doing this again - whoever posted this video is currently themselves being tracked by the cops. The same cops who put out pictures of protesters - who in some cases are not even suspected of committing crimes, but are just wanted as witnesses. The photos that are published in the daily mail alongside vicious headlines.

Don't distribute potentially incriminating footage of public order situations. Just don't do it.

But if you're going to, the very least you could do is blur out faces and destroy the original so when the pigs come knocking (and they will, have no doubt), they can't get at it.

The footage can be seen as part of this corporate news report  http://www.youtube.com/watch?v=id5G_d9obPE