Eight PSNI officers have been injured during street disturbances in east Belfast, with at least one requiring hospital treatment.
Police say the injuries were sustained after they were attacked with missiles and petrol bombs by a crowd of around 100 people. A car was also set on fire in the Templemore Avenue area. Two people were arrested.
The trouble is linked to an earlier protest by Loyalists against the decision by Belfast City Council to restrict the flying of the union flag over City Hall.
Last night, around 300 loyalists blocked roads in Carrickfergus and east Belfast in flag protests.
Loyalists across Northern Ireland have been protesting since councillors in Belfast voted on 3 December to limit the number of days they fly the union flag.