From the bbc website
Arrests made after officers struck by fireworks - police
Earlier we reported that officers detained a breakaway group of about 150 people from the pro-Palestinian demonstration.
The statement from the assistant commissioner says the group of 150 were "wearing face...
I was under the impression that Stop the War were just one of six groups involved in organising this weekends demo …others including
Palestine Solidarity campaign
Muslim Association in Britain.
Etc
Vast majority of what I’ve seen come under the pro Palestine banner/flag …with the odd naughty one…oh and apparently Marxists and Socialist Workers Party have been present …in addition to that quoted by you