Officers made arrests for criminal damage, assault and supporting a proscribed group as thousands gathered on Whitehall.
Metropolitan Police launch a murder investigation after a gunman opened fire near a crowd of up to 50 people, including children.
Hundreds of fans had gathered near Western Europe's tallest building to see the actor-turned-politician before the Metropolitan Police intervened.
One man is fighting for his life after a fight broke out at a KFC branch in south-east London.
