Police were called at around 10.15pm on Saturday after the teenager was taken to the medical scene of the incident. He was taken to hospital but died earlier on Sunday. “While the exact cause of his death is yet to be ascertained, one line of inquiry is that he had taken a certain type of ecstasy tablet (MDMA), which was described as a gray or black oblong shape,” Assistant Chief Constable Kathryn said. Hankinson. “At this time it is believed to be an isolated incident as we have not received any similar reports.” The boy’s parents have been informed. Police said anyone who feels ill after taking any substance should seek immediate medical attention. Officers are carrying out inquiries at the festival site and are liaising with the organisers. Anyone who can help with the investigation is asked to either contact police or security on the scene, call 101 or use the LiveChat feature on the West Yorkshire Police website. Leeds Festival comes to a close on Sunday night with headline acts from Sheffield bands Arctic Monkeys and Bring Me The Horizon.