All in all for what was just about one arrest the situation very quickly got out of hand. The police repeatedly charged into the centre of the harbour area in squads of around 30 or so, and thus became surrounded by thousands of people... some might call it provocation.
At one point they were slowly pushed back out by a crowd of hundreds all with their arms raised above their heads, but then the police just turned around and charged back in again spraying people with pepper spray.
It was clear the crowd was prepared to protect itself from this police attack, but the police tactics just served to inflame the situation. Quite incredible given the march had passed off without incident.
Of course the harbour area was filled with tens of thousands of people and thousands more were still waiting to finish marching in. People stood amazed watching the police actions for at least one hour while they rushed back and forth along the edge of the harbour stadium area. There were at least many hundred riot police perhaps more involved in the main clashes.
It eventually subsided and people were able to get on with the rally / concert / chilling out, with the polcie witghdrawing, but it seems it's all started up again now and water canon and gas is being used... more later....