Police have come under attack for a fifth consecutive night in Northern Ireland, with petrol bombs thrown at them in Portadown last night.
A senior PSNI officer said there would be a "scaled up" policing presence across Northern Ireland in anticipation of further disorder over the weekend.
Assistant Chief Constable Ryan Henderson said the mobilisation, which would include officers sent over from Scotland, was "to reassure our communities and protect our streets".
Disorder started in Ballymena on Monday after an alleged sexual assault of a girl in the Co Antrim town at the weekend, and continued throughout the week.
The unrest and riotous behaviour spread to other towns including Larne, Belfast and Coleraine.
A number of homes were targeted, and the Northern Ireland Housing Executive has said about 50 households have received assistance across the week, and 14 families provided with emergency accommodation.
The focus of the violence shifted to Portadown on Thursday and continued yesterday - although at a lower intensity than scenes observed earlier in the week.
Sixty-three police officers have been injured in the sustained disorder which led political leaders to call for calm during a meeting of the British Irish Council in Newcastle, Co Down.
Northern Ireland First Minister Michelle O'Neill said everyone is condemning the disorder and calling for it to stop.
"What we have seen over the last four days has been devastation, has been horrific for those people targeted - these are women and children, these are families, at the brunt of racist, violent attacks, and it is wrong on every level," she said.
"The whole of the Executive is united on that front," she added.
Deputy First Minister Emma Little-Pengelly described a "difficult time for Northern Ireland" with "disgraceful scenes of violent disorder", and said her thoughts are with the residents of the areas affected.
Additional police officers from Scotland will support the Police Service of Northern Ireland after a mutual aid request.
Scottish First Minister John Swinney said it was an illustration of how cooperation between police forces is "absolutely essential".
There have also been incidents in other towns, including the burning of Larne Leisure Centre on Wednesday and an arson attack on a house in Coleraine in the early hours of this morning from which a man and woman, and four young children escaped.
It is being treated by police as arson with a racially motivated hate element.
A woman in her 50s and a man in his 30s were arrested on suspicion of riotous behaviour and other offences in connection with the disorder in Portadown.
A small fire at the Manse Road roundabout in Newtownabbey was also reported, and anti-immigration graffiti is being investigated in Newtownards.
Meanwhile, a house fire in the Mount Street area of Coleraine which led to the evacuation of a family with three young children is being treated as deliberate and a racially motivated hate crime.
Police Federation chairman Liam Kelly said it has been "a week of shame with appalling levels of unrest in towns and cities".
"Burning people out of their homes, attacking a leisure centre, and the specific targeting of individuals and property fuelled by overt racism and prejudice, is totally deplorable," he said.
"Yet again, our overstretched police officers have also been attacked with petrol bombs, bricks and fireworks as they sought to keep people safe and maintain law and order.
"They have held the line with great courage and professionalism and are owed a debt of gratitude by this community," he added.
"They went to the aid of vulnerable people, have prevented further savage attacks and have undoubtedly saved lives," he said.
Police Service of Northern Ireland Chief Constable Jon Boutcher warned on Thursday that his officers would be coming after the "bigots and racists" behind the disorder.
