Police sirens scream through the streets of Belfast during another night of clashes between police and pro-British loyalists.<br/> <br />Militant groups have fought with police in several instances over the past month over the removal of the British flag from the Belfast City Hall building.<br/> <br />Protesters threw bricks and crates at armoured vehicles (nats) and fireworks at police officers.<br/> <br />At least 70 people have been arrested.<br/> <br />Officials say recent tensions have been among the province's worst since a peace accord was signed in 1998 that ended 30 years of conflict.
