A number of arrests were made at a festival held at Deene Park near Corby.
The Illusive Festival took place in the grounds of the country house over the weekend.
During the three-day event, which has six musical arenas for bands, DJs and performers, four men were arrested for drug offences and are currently in police custody.
A spokesman for Northamptonshire Police added that another man was also given a caution for possession of drugs.
For more information about the festival, go to illusive-festival.co.uk.