Several hundred ecstasy tablets were seized from revellers attending a Fatboy Slim beach party in Co Antrim, police said today.
Thirteen people were arrested for drug offences during the event in Portrush, which attracted 20,000 dance fans to the East Strand.
The Police Service of Northern Ireland said concert-goers were generally well behaved but the force was critical of the levels of street drinking ahead of the renowned DJ’s gig.
A police spokeswoman confirmed 11 people were arrested in the seaside resort on suspicion of possession of drugs and possession with intent to supply.
As as well as the ecstasy tablets, officers also seized quantities of herbal cannabis, cannabis and amphetamines.
Two people were also arrested at Upperlands, Co Derry on suspicion of possession of illegal drugs.
Police said those arrested were expected to appear in court at a later date while those caught drinking in public will have to pay a £100 (€147) fine.