Nine police officers have been injured during a second night of serious disorder in north Belfast.
Three were taken to hospital during trouble that saw rioters armed with petrol bombs attack police lines in the Carlisle Circus area of the city.
Officers used water cannon and fired six baton rounds at the crowds as troubled flared on Monday night.
Rioters also hurled stones, bottles, fireworks and rocks and hijacked a van in Denmark Street before pushing it towards police lines.
The extent of the injuries sustained by the police officers taken to hospital are not yet known.
Terry Spence, chairman of the Northern Ireland Police Federation, which represents rank and file officers, said: “Their bravery and courage is in stark contrast to that of the cowardly thugs responsible for trying to murder them.”
The latest disorder came after 47 PSNI officers were injured on Sunday night during riots linked to a republican parade nearby and a loyalist protest.
The PSNI advised motorists to avoid the Carlisle Circus area due to the ongoing trouble.
A police spokesman described events last night as “serious disorder”.
“Petrol bombs and other missiles [were] thrown [and] water cannon deployed,” the PSNI said via Twitter.
Tommy Cheevers of the North and West Belfast Parades and Cultural Forum said the violence on Sunday and last night was “not justified”.
“The problem is that people feel they have nowhere else to go,” he added.
“The Parades Commission approved Sunday’s republican parade along North Queen Street area without any restrictions, going into a clearly volatile area. But it did place restrictions on a loyalist parade in the same area.
“I have been in face-to-face dialogue with residents and Sinn Fein from 1998, so I am fed up with the big stinking lie being given out in recent days that we must now engage with residents. I will not be engaging with the commission any longer, due to the way they speak to us.
“In Portadown the loyal orders have been pressing for talks with residents group for years and they refuse. But the Parades Commission do not then allow the Drumcree parade on alternate years as a compromise.
“The frustration I am getting from all over Northern Ireland is that loyal orders see that same situation in Drumcree coming their way - all parades being taken off the streets.
“The Secretary of State needs to address the fact that the Parades Commission is out of control and answerable to nobody.
“The decisions by the Parades Commission are inconsistent and have no logic from one determination to another. Republicans created the residents groups and the Parades Commission is making things worse.”
Yesterday Chief Constable Matt Baggott warned that Northern Ireland cannot afford a repeat of the sectarian violence that left almost 50 police officers injured after riots in north Belfast on Sunday.
Water cannon was deployed on Sunday night when the officers were attacked with fireworks, petrol bombs and masonry in disturbances they said initially involved several hundred loyalists.
Nationalists were also involved in the clashes which surrounded a republican march, but which were close to the scene of recent disorder around a loyalist parade.
The chief constable called on community leaders to take action to reduce tensions.
Mr Baggott said yesterday: “I am very proud of the courage and restraint shown by my officers last evening, in the face of extreme violence that resulted in 47 officers being injured and a number needing hospital treatment.
“We will continue to act as peacekeepers and to keep communities safe, however others have a responsibility within the community and wider society to resolve the conflict and tensions surrounding parading.
“Policing and the wider Northern Ireland community cannot afford a repeat of last night’s events.”