As many as 80 police officers have been hurt in Northern Ireland after rioting in north Belfast on Tuesday.
Police were attacked by a group of nationalists after unionists took part in an Orange Order parade near shops.
Nationalist political party Sinn Fein blamed police for the riots, while unionist political party the DUP said the violence had been planned.
One of the police officers was seriously injured after petrol bombs, bricks and bottles were thrown at them.
Police used water cannons to try and calm the rioting, which Sinn Fein said wasn't the right thing to do.
But the police said that using water cannons was the right response for the level of violence that they were facing.
The Twelfth of July Orange Order parades mark the victory of the Protestant Prince William of Orange over the Catholic King James II at the Battle of the Boyne in 1690.