23 police officers and an MP were among those injured during a night of fierce violence in Northern Ireland.
Twenty-nine police officers were injured during sectarian riots between republicans and loyalists in east Belfast today.
The union flag will be raised at dawn over Belfast City Hall for the first time since the dispute began last month.
The Police Service of Northern Ireland has confirmed that fifty six officers were injured during clashes in the city of Belfast last night.
56 police officers were injured during last night's disorder. 4 received hospital treatment and 1 remains in hospital at this stage. 1/2
There were 7 arrests - offences included riotous behaviour, disorderly behaviour & hijacking. 26 AEP discharged and water canon deployed 2/2
Stormont's Justice Minister David Ford said there could be no excuse for last night's rioting in Belfast.
Mr Ford said: "Violence is wrong and no cause, no dispute, no disagreement can justify it.
"The scenes of loyalist protesters attacking the police service will quickly replace the positive images many have worked hard to deliver in recent weeks.
"Some individuals and groups may not agree with determinations from the Parades Commission, but they do have the weight of the law behind them".
Northern Ireland Secretary Theresa Villiers called last night's violence in Belfast "shameful" after 26 police officers were injured.
Ms Villers continued, "After success for Northern Ireland this summer as host to both the G8 and the World Police and Fire Games, disorder on the streets is a hugely regrettable step backwards.”
Sinn Fein said it is "absolutely determined" that a republican commemoration due to take place in County Tyrone tomorrow will be "peaceful and dignified".
Sinn Fein MLA Barry McElduff, one of the organisers of the event in Castlederg, told BBC Radio 4's Today programme, “We work very hard at making sure it is peaceful and dignified.”
Pressed on whether it was “wise” to hold the parade, which commemorates deceased IRA members, Mr McElduff answered, “Is it wise for the month of November to be dedicated to remembering British Army contributions to wars all over the world?”
Belfast's deputy lord mayor Christopher Stalford said the police had been urged to ask Northern Ireland Secretary Theresa Villiers to step in to prevent the parade that led to violence in the city last night.
The DUP politician told BBC Radio 4's Today programme: "We went and spoke to the police the day before yesterday and we said the police have the power to recommend to the Secretary of State that a Parades Commission decision should be overturned.
"Anyone who knows Belfast and knows Belfast politics could see, tragically, this was coming down the line."
Police Service of Northern Ireland Assistant Chief Constable George Hamilton has condemned those responsible for Friday night's violence in Belfast, which left 26 officers injured.
Whilst facilitating the Parades Commission determination for tonight's parade and associated protests, police have come under heavy and sustained attack by crowds intent on creating disorder.
As Northern Ireland moves ahead, the effect of tonight's violence has the potential to damage the local economy and the reputation of Belfast as a tourist destination.
As disturbances are continuing, I would call upon people of influence in communities and those in political leadership to do all possible to reduce tension.
The latest disorder comes after eight officers were injured when trouble flared at a republican anti-internment bonfire near the city centre on Thursday night.
Twenty six police officers were injured when serious loyalist rioting engulfed Belfast city centre on Friday night in violence linked to a contentious republican parade.
Five of the officers required hospital treatment and there were reports that a number of members of the public were also injured.
The disorder first flared in the Royal Avenue area, a usually busy shopping district close to City Hall, as hundreds of loyalist demonstrators gathered to protest at the rally to mark the introduction of internment without trial in Northern Ireland during the Troubles.
The organisers of the Anti-Internment League parade had been given permission for the event from the Parades Commission adjudication body.
As loyalists attempted to block the route, riot police were attacked with a sustained barrage of bricks, bottles, fireworks, metal guttering ripped from shop fronts and pint glasses apparently raided from a nearby bar.
A police officer was knocked to the ground after debris thrown by protesters in Belfast hit their helmet earlier this evening.
As the officer fell jeers could be heard from the crowd. Two police officers are known to have been injured in clashes today.
Police have been trying to quell unrest in central Belfast after loyalists gathered ahead of a republican parade.
Officers have faced a sustained barrage of bottles, fireworks, metal guttering ripped from shop fronts and glasses apparently raided from a nearby bar in Belfast in initial clashes with loyalists ahead of a republican parade.
The anti-internment league parade, which started in north Belfast earlier, was delayed from entering the city centre as police attempted to restore order.