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The death toll from fighting in Northern Ireland has risen to four with a fourth person confirmed as a civilian killed in shelling on Monday near Derry.

Tension reached its highest level since the violence appeared to have eased after last Wednesday’s peace accord.

At least 21 people have been killed and more than 400 injured in the violence, police say.

The Ulster Unionist leader, Peter Robinson, has denied that his party has failed to take “responsibility for” the violence.

In a statement issued on Sunday evening, Mr Robinson and Ulster Unionist leader Mike Nesbitt said: “The police are doing a fantastic job. They are doing an incredible job. They are working around the clock to protect and assist the thousands of people in Northern Ireland who continue to seek refuge.”

The chief constable of Northern Ireland police, Mr James Hughes, issued a statement earlier on Sunday denying claims the police had failed to make the political demands they had demanded on Monday.

“Any suggestions that the police have failed to comply with their political obligations and carry out their political duties is categorically wrong,” said Mr Hughes.

His remarks follow comments from the US Secretary of State, John Kerry, who has said that the ceasefire between Sinn Féin and the SDLP on Sunday, which had been agreed by Prime Minister David Cameron, had been too fragile to remain.

But in his statement on Sunday evening, Mr Nesbitt said the peace process had been “thoroughly respected and is now at the height of its strength”.

Image copyright PA Image caption Many Protestants want an apology from the unionists for the sectarian violence

Speaking in the North Belfast constituency of South Down MLA Mike Nesbitt, Mr Nesbitt added: “Sinn Féin and SDLP have made clear the terms of their agreement to end all violence on Sunday, and we intend to honour them.

“However, the parties are clear that a full explanation should be given for why we are still in violence. Such attempts to shift the blame for the violence are not acceptable and are to be opposed at all costs.”

In a statement on Sunday morning, Northern Ireland secretary of state James Brokens

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