Disorder has now moved to Woodvale Parade, off Woodvale Road in north Belfast and water cannon is being used.
Water cannon have moved in to clear the entry off Woodvale Avenue where police are being attacked by loyalists.
A small group of masked youths are involved involved in the disturbances.
Police are dealing with disorder in the Woodvale Rd area of North Belfast. A number of missiles have been thrown at police lines.
PSNI Chief Constable Matt Baggott today condemned those responsible for the trouble and also criticised those within the Orange Order leadership who called for protests.
Police in the Woodvale area of north Belfast have come under sporadic attack from loyalists, who had earlier attempted to march along a road.
Stones and bottles have been thrown.
Loyalist protesters are staging a peaceful protest at top of Twaddell Avenue in north Belfast, close to the Ardoyne area.
The Police Service of Northern Ireland say they are preparing for the worst but hoping for the best tonight. That is evidenced by the 400 extra officers from England, Scotland and Wales that have been brought in to bolster the PSNI.
That's in addition to the 600 that are already here. So the force has the capability, numbers wise, to deal with any further disorder.
The Orange Order have called for the protests to end, and many will be hoping that those calls are heeded this evening.
Police in Northern Ireland said the Orange Order "should reflect" on their decision to call on their supporters to protest, following violent scenes at yesterday's Orange parade.
ITV News' Marc Mallett reports.
Northern Ireland Secretary of State Theresa Villiers said there was no justification for the trouble in Belfast.
She said: "I utterly condemn the rioting that took place in Belfast last night. Attacks on the police are completely unacceptable and there can be no justification for this kind of behaviour.
"This sort of behaviour does nothing to promote 'Britishness' or the pro-union cause. Rather it undermines it in the eyes of the overwhelming majority of people here in NI and in the rest of the UK.
"Once again I pay tribute to the bravery of the Police Service of Northern Ireland and officers from Great Britain who did such an outstanding job in upholding the rule of law. They deserve our utmost praise and support."
Four hundred extra police officers from Great Britain are being deployed to Northern Ireland after a night of serious loyalist rioting in Belfast that left more than 30 officers injured and an MP hospitalised.
Democratic Unionist Party MP for North Belfast Nigel Dodds was taken to hospital after being struck in the head by a brick during the unrest on the Woodvale Road in his constituency.