A Celtic supporter was arrested before his team's clash with Manchester City - for allegedly throwing a hamburger at a police horse.
Greater Manchester Police's city centre Twitter account revealed that the bizarre incident took place in Piccadilly Gardens ahead of the Champions League clash at the Etihad Stadium.
They added that the accused would be spending the night in a cell.
Around 4,000 supporters of Brendan Rodgers' side made their way south for the clash, with the majority well behaved.
However, reports later emerged of visiting supporters letting off fireworks on a tram, causing a nuisance in home areas of the stadium and of a group who tried to storm a gate to gain entry to City's ground.
Midway through the second half, police had made 13 arrests, with 12 for public order offences and one for possession of drugs.
GMP launched a large operation for the match with the deployment of officers on par with a Manchester derby.
A police statement said: 'At around 4pm on Tuesday 6 December 2016, a 27-year-old man was arrested in Piccadilly Gardens on suspicion of being drunk and disorderly.
'This was following an incident where a burger was thrown at a police horse taking part in the match day operation ahead of the Manchester City v Celtic match at the Etihad.
'The man remains in custody.'