At least seven police officers have been injured after coming under attack by crowds of rioters in west Belfast.
Petrol bombs and missiles, including stones and bricks, were thrown at officers in the nationalist areas of Broadway, Old Park and North Queen Street.
A bus was also hijacked and driven at a police cordon, but crashed a short distance away.
It happened as loyalists and unionists prepare for the traditional Twelfth of July celebrations, with feeder marches in all areas, and rallies in a number of towns, including Limavady, Sixmilecross and Clogher.
Meanwhile, a Strabane Councillor has expressed concern at reports of men, wielding hurleys and wearing balaclavas, removing flags and bunting erected as part of 12th of July celebrations.
Councillor Derek Hussey is blaming members of the 'republican' community who he says are not prepared to acknowledge the right of the Unionist minority within the community to celebrate their heritage.
He says there have also been attacks being perpetrated on young people and vehicles perceived to be Protestant.
Councillor Hussey says some are determined to cause tension in the Killen and Castlederg area....