T in the Park organisers have urged fans not to buy from touts after learning that a number of forgeries are in circulation.
The fake tickets were discovered by official ticket agent TicketMaster, who operate the AccessManager system which scans the barcode of all tickets as festival goers enter the festival site.
Festival Director Geoff Ellis said: "If you have bought a ticket from an unofficial source then do not attempt to travel to the festival as you will not gain access to the event. Our ticketing system AccessManager will pick up any fraudulent tickets which will be referred to the police."
Revellers have also been asked to be extra vigilant following the failed car bombings in Glasgow and London.
There will be an increased security operation including stringent searches so expect delays getting in, police have warned.
The Scottish Crime and Drug Enforcement Agency (SCDEA) has also gone on the offensive on cocaine use.
Police will be patrolling the site, however they are also trying to appeal to peoples' consciences by highlighting the exploitation of poor farmers and children involved in producing the coca crop in South America.
T in the Park's campsite opened this morning and 60,000 campers are expected to arrive in time to see Lily Allen open the main stage for the first time ever on a Friday later this afternoon.
Other acts today include The Coral, Bloc Party and Arctic Monkeys. Check out our T In The Park preview.
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