http://www.bbc.co.uk/news/uk-northern-ireland-18823292Nine police officers have been injured dealing with trouble following the passing of a Protestant parade through the Catholic Ardoyne area in north Belfast.
Their injuries are not believed to be serious.
Petrol bombs and bricks have been thrown at police by nationalists and loyalists.
Police have responded by using water cannons to contain the crowds. Six plastic bullets have been fired.
There have been two arrests although police expect more to follow.
Three cars have also been hijacked and two of them pushed at police. At least one of them has been set alight.
Police are continuing to deal with "significant disorder" in the nationalist Brompton Park and Balhom Road areas in north Belfast.
A short distance away police were attacked with bricks and bottles thrown by loyalists on the Crumlin Road near the junction with Hesketh Road.
On the other side of the Ardoyne flashpoint zone at Twaddell Avenue, bricks and bottles were also thrown at police by loyalists.
The senior police officer in charge of the security operation in north Belfast, Assistant Chief Constable Will Kerr urged "individuals and communities" affected to respond to developing events in a "calm and responsible manner".
"Violence has serious and unwanted consequences for us all and we will robustly investigate all incidents of disorder," he said.
Some nationalists object to the parade which marks William III's victory at the Battle of the Boyne in 1690.
Earlier, 24 Orange Order marchers completed a parade past the area.
The trouble broke out after Protestant Orangemen, who are members of north Belfast lodges, walked past a row of shops in the Catholic area.
A protest by Catholic residents to show their opposition to the Orangemen walking through the area was held along with a parade by the group Greater Ardoyne Residents Coalition (GARC).
"The Greater Ardoyne Residents Coalition parade was delayed at Estoril Park by agreement due to a public safety issue caused by the significant disorder and a burning vehicle," said ACC Kerr
"Once this was cleared, the GARC parade continued on to the Crumlin Road.
Shit, this really doesn't need to be restarting.