Trouble has flared again in north Belfast in the same area that witnessed serious disorder on Friday night.
Bottles and other missiles were thrown at police lines on the Woodvale Road.
The unrest has not yet reached the intensity of the clashes between loyalists and police on Friday night.
Police said the disorder was "sporadic", and officers have deployed water cannon on the rioters.
The Woodvale Road and the Newtownards Road in east Belfast witnessed the worst violence on Friday, with 32 police officers injured. MP for North Belfast Nigel Dodds was taken to hospital amid the clashes in Woodvale after being struck by a brick. He was discharged on Saturday morning.
Four hundred extra police officers from Great Britain have been deployed to Northern Ireland after Friday night's rioting.
More than 600 mutual aid officers from England, Scotland and Wales were already in the region supporting the Police Service of Northern Ireland (PSNI) operation as tensions surrounding the traditional Twelfth of July commemorations spiralled into disorder.
Trouble flared on Friday night as police attempted to enforce a decision banning a controversial Orange Order parade from passing the republican Ardoyne area on the Crumlin Road in north Belfast. Disorder then spread to east Belfast during six hours of violence.
The Orange Order had originally called for protests against the determination of the Parades Commission adjudication body but, in the wake of the violence, late Friday night senior Orangemen called for protest action to be suspended.
PSNI Chief Constable Matt Baggott condemned those responsible for the trouble and also criticised those within the Orange Order leadership who called for protests.