Just to update people. The boy was seriously injured by a smoke bomb in his pocket. He suffered 40% burns (3rd degree burns). He almost didn't make it through the night, but is stable in a hospital outside of London. It was not a malicious attack, but a very horrific accident. I was one of 3 adults who tried to do whatever we could. I hope those other 2 adults (and their kids) are able to move on with their lives, as this was deeply traumatising for all involved. It has helped me greatly to hear that he will make a full recovery, and that the fast actions of those people who called 999, and gave First Aid probably saved a young life.