Making one of her last foreign trips as U.S. Secretary of State, Hillary Clinton arrives in Northern Ireland to show support for the province's fragile peace.<br/> <br />But violence broke out just hours before her arrival when pro-British loyalists, enraged at a decision by nationalist councillors to remove the Union Jack flag from above the entrance of Belfast City Council, battled with police.<br/> <br />A number of police officers were injured and four people were arrested.<br/> <br />An office belonging to the non-sectarian Alliance Party, whose support enabled the nationalists' vote to bring down the British flag, was also ransacked and set on fire during the rioting.<br/> <br />Northern Ireland remains riven by sectarian tensions and Clinton arrives in a week that has seen three riots.<br/> <br />Straining tensions further, police seized a home-made bomb in a car on Thursday night.<br/> <br />Clinton is set to meet politicians from both sides of the political divide during her trip.
