Toilets within the concourse at Celtic Park have been badly damaged following Saturday's Old Firm derby.

Police Scotland said they were aware of the damage but added Celtic FC are investigating the matter internally.

The images, which appeared on social media, show the door of a toilet cubicle which has been pulled off, as well as ceiling tiles which have been pulled down, leaving exposed wiring.

Police have otherwise praised the behaviour of both Celtic and Rangers fans, with only one arrest made at the match.

Celtic won the midday match 5-1 in front of a sell-out crowd of around 60,000 supporters.

Police Scotland warned fans to be on their best behaviour before the game at Parkhead and confirmed just one man, aged 22, was arrested within the stadium over an alleged alcohol-related offence.

Chief superintendent Brian McInulty said: "I would like to thank all the supporters who came to enjoy the match today in a safe and responsible manner.

"You listened to what we asked and behaved accordingly which has helped our officers ensure the safety of everyone attending the venue.

"All fans came out to enjoy the match and soak up the atmosphere and this is what football should be all about.

"I sincerely hope that the good spirits of both sets of supporters continues throughout the rest of the day and the rest of the evening."