Loyalist thugs who have rioted for eight nights in Belfast have brought shame on the Union flag, the UK Government has said.
Yobs have wreaked havoc across Northern Ireland's capital after the city council passed a motion limiting the number of days on which the flag can fly.
Northern Ireland Secretary Theresa Villiers told the Commons that 32 police officers had been hurt and 38 people charged over the violence, which saw a policewoman flee her car after a petrol bomb was thrown into the vehicle.
The Northern Ireland Secretary said: "No-one can be in any doubt about this Government's support for the union and its flag, but those people engaged in the kind of violence we have seen in the past few days are not defending the Union flag.
"There is nothing remotely British about what they are doing; they are dishonouring and shaming the flag of our country with their lawless and violent activities. They discredit the cause they claim to support."
The "deplorable" outbreak of violence has seen an "appalling" death threat issued against Alliance MP Naomi Long, whose cross-community party backed the move to reduce the number of days the flag is flown from City Hall, said Mrs Villiers.
"There can be absolutely no excuse or justification for the kind of thuggishness and lawless behaviour; it is despicable, we condemn it unreservedly and it must stop immediately," she added.
"The right of elected representatives to go about their daily business without the threat or fear of intimidation is one of the hallmarks of our democracy. These threats are nothing less than an attack on our democracy."
She urged all of Ulster's politicians to condemn the "disgraceful" violence and focus on other issues, including boosting the province's economy in the run-up to Christmas.
Making a Commons statement, Mrs Villiers said: "Everybody has a responsibility to consider carefully the impact of their words and deeds on wider community relations. Once again, the trouble we have seen in Belfast and elsewhere underlines the urgent necessity of working towards a genuinely shared future for all the people of Northern Ireland."