More than 3,000 loyalists brought Belfast's normally busy shopping area to a standstill on Saturday during a protest march in open defiance to a Parades Commission ruling.
Thousands - including bands and supporters - marched from City Hall to north Belfast at around 1.30pm.
But the parade - organised by a group called Loyal Peaceful Protesters - was in breach of a Parades Commission decision which said the march should have moved off from City Hall no later than 12.30pm.
Police warned those gathered they were in breach of the decision and were now part of an illegal gathering.
Officers told the crowds through a speaker system that the parade was unlawful, and that those gathered could face prosecution, with large digital matrix signs along Royal Avenue stating the same message.
Around 20 bands took part in the march which made its way from City Hall to Donegall Place and on to Royal Avenue.