Flag row clashes for 5th night.
The demonstration at the civic building in the city centre was held as Belfast City Council met for the first time since its controversial decision to limit the flying of the flag on the roof.
Trouble flared again in the east of the city for the fifth night in succession.
Police were attacked by rioters throwing heavy masonry as they tried to separate rival factions at a flashpoint between loyalist and republican areas on the Newtownards Road. Water cannon was deployed in a bid to restore order.