Twenty nine police officers are injured as water cannon is used during fresh sectarian clashes between loyalists and republicans in east Belfast.
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Trouble flared after a city centre demonstration against the council's decision to limit the number of days the Union flag is flown from City Hall.
Water cannon was deployed and a non-lethal baton round fired by riot police as they separated opposing factions amid a hail of bricks and fireworks at the Albertbridge Road near the nationalist Short Strand.
Earlier, nearly 1,000 people gathered at Belfast City Hall to protest.
Senior politicians from Belfast, Dublin and London are to meet next week to discuss the protests after more than 40 days of road blocks and sporadic violence by loyalists have failed to produce a solution.
Stormont First Minister Peter Robinson and his deputy Martin McGuinness will join Northern Ireland Secretary Theresa Villiers and Ireland's Tanaiste (deputy leader) Eamonn Gilmore.
Nothing to do with 'real issues'
Mr Gilmore said: "This violence is being orchestrated and those behind it are known criminals, intent on creating chaos.
"This has nothing to do with real issues around flags and identity in a shared society, which are the subject of intensive political discussions at present."
The demonstrations against Belfast City Council's decision to hoist the union flag from the City Hall only on designated days like royal birthdays have brought some parts of Belfast to a standstill.
More than 70 officers have been injured and over 100 arrests made during weeks of sporadic trouble, the Police Service of Northern Ireland (PSNI) said.
Businesses in Belfast's city centre have struggled to cope, with many reporting lost trade, and the Confederation of British Industry (CBI) warned some investors may think again.
09 January 2013
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