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Politicians were threatened last night during a council meeting in Northern Ireland when a group of loyalists stormed the building.
There were no injuries but the session was disrupted in Carrickfergus, north of Belfast on the Co Antrim coast, police said.
Cross-community Alliance Party councillor Noel Williams said about five protesters infiltrated a meeting of Carrickfergus Council.
"They managed to enter the council chamber unhindered without facing any opposition and once inside subjected councillors to verbal abuse, banging on desks and chairs with implements, leaving many feeling threatened," he said.
"It is unacceptable that the town hall was not under police surveillance, especially as violence has broken out at previous protests.
"People have a right to protest peacefully but this incident tonight put many people's safety at risk and must not be tolerated. We live in a democratic society and councillors were meeting tonight as part of this process.
"The Alliance Party has consistently called for protests like these to stop, letting politicians unite as they find a way forward. In the run up to Christmas it is local businesses and the community at large that are suffering."
The disruption came as at least one police officer was injured in new rioting in Belfast as officers were pelted with bricks.
The PSNI said about 80 protests took place across Northern Ireland, with numbers ranging from small groups to hundreds of people.
While most of the protests were peaceful, there was disorder in a number of areas including south and east Belfast, Portadown in Co Armagh and Carrickfergus.
Police came under attack in a number of locations and at least one police officer was injured.
There have been 15 arrests with more to follow as police continue with their robust investigations.
Assistant Chief Constable Dave Jones said: "While most of the protests were peaceful, the violence witnessed in some areas tis totally unacceptable.
"This is now the third week of protests and I am appealing to everyone involved to take a step back from this. It cannot and should not continue. There were arrests this evening and more will follow as we now trawl through evidence gathered by officers out on the ground.
"However, Christmas is less than one week away and now is the time to bring this to an end. I am appealing to those wishing to protest to consider how their actions are affecting the wider community who simply want to enjoy the festive period with their friends and families in peace."
Earlier this month an Alliance party office in Carrickfergus was burned and there have been a series of death threats made against elected representatives in a row over a reduction in the number of days the Union flag is flown from Belfast city hall.
Dozens of Police Service of Northern Ireland members have been injured by violence which erupted earlier this month.
Appeals for the protests to stop have fallen on deaf ears and Belfast traders have warned of a dismal Christmas with the streets relatively empty of shoppers.
Northern Ireland Secretary Theresa Villiers yesterday met leaders of Northern Ireland political parties to discuss the flags controversy.
"I have urged Northern Ireland's political leaders to come together to find a way forward to resolve the ongoing protests on flags," she said.
"It is vital that all the parties work together to make progress towards a cohesive and shared society where decisions on issues like flags can be made in a way which respects different views and takes into account the different traditions and identities of modern Northern Ireland."
She said she understood the strength of feeling but the disruption caused by these protests was damaging Northern Ireland's economy, particularly for retailers heavily dependent on shoppers in the run-up to Christmas.
"The fact that threats and protests continue to impede elected representatives in carrying out their duties also continues to be a major concern."
She said there was a lot to look forward to in Northern Ireland.
"None of us want to see the clock wound back to an era of sectarian tension when there is such important work to be done to rebalance Northern Ireland's economy and boost jobs and growth."
Meanwhile police have said that a 19-year-old man was arrested after a firework was thrown at police from a crowd of protesters in Gaol Square, Armagh city.
Armagh
Gaol Square:
Ballymena
Belfast
Lisburn
Hillsborough Road:
Longstone Street:
Carrickfergus
Minorca Place:
Belfast Telegraph
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