One police officer was injured while numerous others had bottles thrown at them during anti-social behaviour at Crawfordsburn beach.
As hundreds of people flocked to Northern Ireland's beaches to enjoy the warmest day of the year on Monday, there were reports of anti-social behaviour, criminal damage, and a large altercation.
Police in Ards and North Down also seized a "quantity of drugs and a large amount of alcohol" at Crawfordsburn.