An investigation has been launched after amid claims a historic building at Glasgow Cross was vandalised by Celtic fans.
Thousands of supporters gathered in the Merchant City area on Saturday to celebrate the club winning the Scottish Premiership title.
Police said there was an 'unacceptable level' of anti-social behaviour on display as well as litter left strewn across the streets.
The force is also now investigating damage caused to the Mercat Cross building during the celebrations.
The windows of the structure, which dates back to 1930, have been smashed, with cans of booze left inside, reports the Daily Record.
The door of Mercat Cross - which is a copy of the original building, which stood on the same spot up to the mid-seventeenth century - was also vandalised as people gained entry.
Officers have confirmed that they are investigating the incident and inquiries remain ongoing.
A spokesperson for Police Scotland said: "Officers are investigating vandalism to the door of the Tollbooth at Glasgow Cross and enquiries are ongoing."
The city's Labour MSP, Paul Sweeney, branded the act as "disappointing" and called on Celtic Football Club to pay for the repairs.
He wrote on Twitter: “Disappointing to hear reports that Celtic fans gathered at Glasgow Cross have broken into the 1930 Mercat Cross building by Edith Burnet Hughes.
“I hope @GreaterGlasgPol secure this historic building and that no damage has occurred beyond forcing its door.”
He added: "With regards to the Mercat Cross Building, I hope Celtic FC will do the right thing and offer to pay for any repairs that are required.”
Six people involved in the celebrations were arrested, and four were given fixed penalty notices, for alleged offences including assault and acts of public disorder.
Officers confirmed that there were no serious incidents of disorder during the celebrations.
