Detective Superintendent Sean Wright was speaking as police released further images of people they want to speak to about the disorder.
So far, 219 people have been arrested by the Operation Dulcet taskforce, which was set up in response to weeks of unrest across Northern Ireland.
Almost 170 people have been charged in connection with the disorder and 60 have been reported to the Public Prosecution Service.
Violence sparked after some Union flag protests, with more than 100 police officers injured as crowds pelted them with bricks, bottles and fireworks.
DS Wright said so far the team has had "a very positive response" from the public.
"There are people out there who will know the identity of these 15 people who I am looking to speak to. I am confident that those people will come forward with that information.
"It is vital that we all send out a message to those involved in public disorder that such behaviour will not be tolerated. Those who break the law must face consequences for their actions. They will be dealt appropriately and proportionately through the criminal justice system," he added.
The senior detective also appealed directly to those featured in the images to contact his team.
He added: "I would ask anyone who believes one of the images is of them to contact us immediately in order to help us with our inquiries."
Anyone who could identify any of the people in the images is asked to contact police.