Nineteen people - including a 16-year-old-boy - have now been arrested following the violence in parts of Northern Ireland this week.
Thursday night was relatively quiet although police say an arson attack in north Belfast is linked to the disorder.
The fire service was called to the Shore Road on Thursday night where a blaze had been set at the rear of a house - there are no reports of injuries.
A leading member of the Indian community in Londonderry has said some health care professionals from overseas have told him they are now questioning whether they should have come to Northern Ireland at all.
In an update on the disorder, police also said they were alerted to race-hate graffiti in the Dee Street and Newtownards Road area of east Belfast.
The Police Service of Northern Ireland (PSNI) say its policing operation will remain over the weekend to ensure public order is maintained.
Dr Mukesh Chugh has lived and worked as a doctor in Derry for more than 20 years.
"We hear especially from people who come from different nations and people of different colour - their houses are gone, their cars are gone, their windows are smashed," he told BBC Radio Foyle's North West Today programme.
"We're in a WhatsApp group and there are messages floating that a certain family has been made homeless overnight and they were a family with small kids.
"I believe that people are anxious, people are in fear and they need reassurance at this point."
The disorder was sparked after footage of a knife attack in north Belfast on Monday night was shared widely on social media.
Hadi Alodid, a 30-year-old originally from Sudan, appeared in court on Wednesday charged with attempted murder over a knife attack in north Belfast on Monday that caused serious injuries to the victim, Stephen Ogilvie.
Violence broke out across Northern Ireland on Tuesday night, with homes, businesses and vehicles targeted.
Further disorder followed on Wednesday, particularly in Glengormley and Portadown, where police came under attack and deployed water cannon.
Police said 12 officers were injured and 16 people were arrested during Wednesday night's unrest.
Dr Chugh said: "We should not judge the whole immigrant community because of one act of violence done by some person in the street.
"Same goes for people who are on the roads – I don't believe they represent the good Northern Irish people.
"Violence cannot be the answer to violence.
"What it is going to do is create more victims."
Trevor Lucy, chair of Unison's Foyle Health Branch, said many medical staff "have been living in fear for the last few days".
He added that staff in Altnagelvin hospital have been "unusually quiet" this week.
"It's the fear - they're just hoping they can get home safely."
Lucy said staff "are staying at home" and "are afraid to go out".
He is worried the racially motivated disorder witnessed in parts of Northern Ireland in recent years could put international health workers off taking jobs in the region.
"There is a trend now... people are taking to the streets and doing inappropriate things and I'm afraid it will have an impact."
On Tuesday night Pastor Jack McKee was helping people on the Crumlin Road in north Belfast who had been affected.
Speaking to BBC Radio Ulster's Good Morning Ulster programme, he described the scene as "mayhem".
When he went into one house there were two female care workers inside who were "absolutely totally traumatised".
"One of them had been lying on the floor for quite some time and they'd been trying to get help for like four hours."
He said he pleaded with the protesters who were holding bricks outside to give him time to get the women out.
Pastor McKee said he knows of at least one nurse who has now left Northern Ireland for England, as well as six drivers who left on Thursday because they "didn't feel safe".
He said the scenes of the past week has "brought back all those memories" of during the Troubles but it is a "different focus".
"I'm obviously disappointed but I'm also angry because again it's innocent people being caught up in this.
"The people that are being caught up in this are people who contribute to life in Northern Ireland – to the community, to those that are hurting, those that need their help."
He said many of the people involved in the violence are not connected to paramilitary activity but there are "many young men that, sadly, just need a reason to come on to streets".
On Friday Police Service of Northern Ireland (PSNI) ACC Ryan Henderson said protests on Thursday night were "much calmer than we have seen in recent days".
"There were peaceful protests last night at a number of locations, including Newtownabbey, with no significant incidents of public disorder.
"Our policing operation will remain over the weekend to ensure public order is maintained."
Henderson said a 16-year-old boy was arrested for riotous behaviour the previous night.
A man was arrested following criminal damage to a vehicle in the Taughmonagh area of south Belfast on Wednesday.
A 27-year-old man was arrested for disorderly behaviour after throwing a stone at a police vehicle during a mobile patrol in Abbeyville Court in Newtownabbey on Thursday.
The First Minister Michelle O'Neill, deputy First Minister Emma Little-Pengelly, and Health Minister Mike Nesbitt visited the Mater Hospital in Belfast to show "solidarity with healthcare workers" following recent reports of threats, intimidation and racist attacks against staff.
O'Neill said: "Our healthcare workers deliver lifesaving care every single day, often in highly pressurised conditions and they deserve to do so safely, with dignity and respect."
Little-Pengelly said staff show "dedication and professionalism" every day and abuse will not be tolerated.
She said: "We want everyone, regardless of their background, to feel welcome, valued and safe and this visit was an opportunity for us to show our diverse healthcare staff that we stand alongside them."
The health minister said the health and social care system would "undoubtedly collapse" without international workers.
