A leading Northern Irish politician was knocked unconscious by a thrown missile as sectarian tensions spilled over into rioting in Belfast at the climax of the Protestant marching season.
Nigel Dodds, the deputy leader of the Democratic Unionist Party (DUP) -- the province's pro-British, Protestant, conservative largest party -- was rushed to hospital Friday after being hit in the clashes between Protestant loyalists and riot police.
It followed a day of what had been peaceful Twelfth of July parades across Northern Ireland, the pinnacle of Orange Order loyalists' marching season.
Rioting Protestants, some wielding swords, attacked police at a roadblock across the loyalist marchers' preferred route through north Belfast.
Petrol bombs, sticks, fireworks, bricks, bottles, beer cans, drain pipes, and part of a wall were hurled at police, with teenagers among the rioters.
Shirtless men, and others in football tops, attacked police vehicles and officers in riot gear.
Loyalist bandsmen played sectarian tunes.
Around 20 plastic bullets were fired and water cannon used by police. Seven officers were injured, at least three of them knocked unconscious.
Dodds has represented North Belfast in the British parliament since 2001. He had been urging people to desist from violence at the roadblock.
The BBC reported a man who treated Dodds at the scene as saying: "He grasped his head as he went down. He was knocked out cold. I put him in the recovery position and checked his airway.
"He was unlucky because he was also hit by water cannon as I was trying to administer first aid and he got soaked."
The July 12 parade is the culmination of the Orange Order's marching season, and is usually accompanied by violence. The day is a public holiday in Northern Ireland.
The march marks the Protestant king William III's victory at the Battle of the Boyne in 1690 over the deposed Catholic king James II.
The marchers like to stick to traditional routes but there are often clashes as they sometimes pass through what have now become Catholic areas.
The violence broke out following a decision to bar loyalists from walking through a contested flashpoint area where Catholic republicans have gathered in the past to attack police.
Northern Ireland's First Minister Peter Robinson, the DUP leader, appealed for "cool heads".
"Violence and attacks on the Police Service of Northern Ireland and the wider community are wrong, can never be justified and must stop," he said.
"Those who are using the cover of protest to attack the police are massively damaging the cause they support."
Around 3,500 people died in the three decades of sectarian violence between Northern Ireland's Catholics and Protestants that largely ended with a 1998 peace agreement, though sporadic unrest and bomb threats continue.
Watch a report on the rioting, posted online by YouTube user "Video News" on Friday, below.