The Welcome to Hell demonstrators have managed to cause chaos and violence right across Hamburg.
It has been said on radio and television the 21,000 police in the city have been pushed to their limits to control the situation. Extra police from across Germany have been brought to Hamburg for the occasion.
Cars have been burned, buildings damaged.
And after all that it seems the G20 conference has achieved little or nothing.
Pictures of Vladimir Putin with Donald Trump are simply funny.
This evening the G20 guests are attending a concert at the Elbphilharmonie, where Beethoven's Ninth Symphony will be performed.