Robbie Williams will perform at Hampden Park this weekend

Police fear they may have been sold on by touts and warned that anyone using them at this weekend's Hampden Park shows in Glasgow would be turned away.

Promoters DF Concerts said 560 tickets destined for buyers in the Falkirk and Dunfermline areas had gone missing.

Williams will perform to more than 110,000 fans at the stadium.

The passes have now been cancelled and anyone attempting to use them to gain entry to either of the Friday or Saturday concerts face questioning from Strathclyde Police.

Police inquiry

Ch Supt Robin Howe, in charge of policing the concerts, said: "A quantity of tickets are believed to have been stolen and it is likely that they have now been sold on to unsuspecting fans who will be hugely disappointed as these tickets have been withdrawn by the promoters and are no longer valid."

He added: "There will be a special police operation at the turnstiles and anyone in possession of them will be subject to a police inquiry as to how they obtained them."

It is thought about 380 tickets for the Friday and 180 for the Saturday events were stolen.

They were all passes for seated areas.