A 17-year-old has died after attending the Leeds Festival this weekend. The boy was taken to an area hospital in critical condition at 4:45 p.m. on Saturday. He reportedly underwent emergency treatment, but was later pronounced dead shortly after midnight on Sunday.

“We are currently investigating the death and how he obtained the substance he took,” Leeds Festival police commander and Chief Superintendent Keith Gilert said to the Irish Independent.

Two 17-year-old boys were arrested in suspicion of “drug offenses” and remain in custody. Scheduled performers for this year’s festival include Disclosure, Jack Ü, Oliver Heldens, Hannah Wants, Duke Dumont and Sophie.