Concern has been raised over social media videos of a group patrolling streets and confronting migrants in east Belfast.
The group calls itself the 'East Belfast Nightwatch First Division' and some of the videos have over 250,000 views on social media.
The PSNI said it is aware of number of videos circulating on social media and does not tolerate any type of vigilante activity.
In a statement, Chief Inspector Dunne cautioned "any individual or group against taking the law into their own hands".
"It is the responsibility of the police service to enforce the law in Northern Ireland and we are committed to supporting the needs of all of our diverse communities," he said.
"We will robustly review and deal with any offences reported to us."
A local Green Party councillor said the videos are "feeding into the recent tensions across this island".
Speaking on RTÉ’s Morning Ireland, Councillor Brian Smyth said the group ask mostly non-white people for identification and for their addresses.
"Do you think people fee safe here with a bunch of lawless thugs who have no authority, no background checks who are going around accusing people, threatening them for merely existing for being in a public place?," he asked.
Cllr Smyth said he has been in contact with the PSNI but also called for political action.
Meanwhile, Justice Minister Naomi Long said there is "absolutely no place for hate in whatever form it takes and towards whichever part of our society".
"Such threatening and violent behaviour will not be tolerated and those carrying out such threats will be pursued and brought before the courts," she said.
"The Department of Justice, the criminal justice system or legislation alone cannot solve the underlying issues which drive this behaviour.
"It is both a societal and community problem and I will continue to work with Executive colleagues to tackle the issues which allow hate and intolerance to occur in the first place."
