Politicians have condemned the violence which broke out in east Belfast on Monday night.
Around 200 republicans and loyalists clashed after trouble flared at an event to celebrate the closure of a police station.
Missiles and other objects were thrown between opposing gangs and at PSNI officers during the violence on the Albertbridge Road in east Belfast.
The road was closed as police tried to restore calm.
Tensions surfaced when a group of republicans gathered at Mountpottinger police station to mark its final day in operation.
The station was one of 26 the Policing Board agreed earlier this month to sell off to the private sector on the recommendation of Chief Constable Sir Hugh Orde.
The building is near a notorious interface between the republican enclave of Short Strand and the loyalist Newtownards and Albertbridge Road areas.
Residents in Short Strand have long been campaigning for the station's closure and had hailed the Policing Board's decision as a great victory.
'Reckless'

Speaking on U105, DUP MLA Robin Newton said: "Bringing people on to the streets in this foolhardy and reckless manner, the excuse being the celebration of the closure of a police station, has led to the riot and indeed a situation that has got out of control."
But Sinn Fein representative Niall Ó Donnghaile has denied claims that the rally led to the trouble.
"The logic of the rally was explained well in advance, the PSNI were aware of it, and it was also held in the middle of the area, as opposed to an interface," he said.
"I believe and stand over the fact that the people are entitled to celebrate the closure of Mountpottinger given its legacy."
'Unjustified'
A police spokesman said officers had discharged a number of baton rounds during the disturbances. He said no arrests had been made and there were no reports of injuries.
Mr Ó Donnghaile said that the use of plastic bullets by the PSNI was completely unjustified.
He also spoke out about an attack on his family home by, what he referred to as "anti-social elements from within the Short Strand community".
He added: "These are the same anti-social elements who were involved in the interface trouble, which has been ongoing for the past number of weeks. Those involved in such activity are serving no purpose other than attacking the Short Strand community."
SDLP Deputy Leader Alasdair McDonnell has launched a scathing attack on the decision by Sinn Fein to hold a protest in the area on a Bank Holiday, saying it was "madness".
He added: "Now Sinn Fein spokesmen are claiming the protest had no connection with the rioting. This is nonsense, the same sort of pernicious nonsense we used to hear from the marching orders after their coat-trailing parades led to violence. Not only could this violence be predicted, it was predicted."
'Kiddy rioting'
"If Sinn Fein is once again sponsoring interface kiddy rioting in order to compete with the dissidents for community control, we are in a very dangerous situation. It would send a strong signal that they have abandoned even the lip service they have paid to the concept of a shared future and settled once more for ghetto politics." he said.
Mr McDonnell also said: "More than two years into devolution, Martin McGuinness and Peter Robinsion are still blocking publication of the Shared Future (Cohesion, Sharing and Integration) strategy. Hugh Orde was right to raise this failure by Sinn Fein and the DUP in his last word on policing.
"It may suit the DUP to block progress, but why is Sinn Fein playing along while local spokesmen are trotting out all the old lines about heavy-handed policing?" He asked.

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