Event organisers Live Nation and Luger, and ticketing company Ticnet have sent out an official warning for an increasing number of fake tickets. They urge people to only make purchases via authorised sellers.
"It has been revealed that there are more fake tickets than usual to our concerts and events of late," write the companies in a statement.
The fake tickets, which are hard to distinguish by eye, are being sold on a number of websites including Blocket and Tradera.