Police are investigating the deaths of a man and a woman on the first day of the annual T In The Park festival in Perthshire, Scotland.

The deceased are believed to be teenagers but over the age of 18, and the deaths are being separately and as unexplained, according to a statement released by Police Scotland on Friday afternoon (July 8th).

T In The ParkTwo people have died at T In The Park festival

“Police Scotland can confirm we are investigating reports of the death of a female and the separate death of a male at T In The Park,” the statement read. “The deaths are unexplained at this time and work is ongoing to establish the exact circumstances surrounding both. We are unable to comment further at this stage.”

80,000 weekend campers began arriving for the three-day event on Thursday at Strathallan Castle in Perthshire, which will see the reformed Stone Roses headlining on Friday evening, followed by Calvin Harris and Red Hot Chili Peppers on Saturday and Sunday.

More: The Stone Roses to headline T In The Park 2016, in addition to huge Manchester shows

“Our thoughts are with the families and friends at this time. We are offering our full support and assistance,” said T In The Park’s director Geoff Ellis in a separate statement.

On top of the two deaths, police are also believed to be investigating a video posted to social media on Thursday of a mass brawl that started soon after staff opened the gates to the campsite. It shows a number of bare-chested men punching and shoving each other, as onlookers plead with them to stop.

T In The Park has been one of the biggest fixtures in Britain’s festival calendar ever since 1994. Last year, however, it re-located from its old site at Balado Park because of safety concerns over an oil pipeline running underneath the site.

2015’s festival was beset with problems, with many complaining over crowd safety due to bottlenecks at various parts of the site, chaotic traffic management in the area, and a large amount of anti-social behaviour.

More: T In The Park festival-goer sparks frantic police search with prank tweet