Police made 18 arrests in and around the Hampden as the Old Firm derby took place.

Officers said they praised the majority of fans who behaved well during the Scottish Cup semi-final.

Police are continuing to investigate the use of flares, smoke bombs and offensive singing at the match.

The arrests included alleged cases of assault, sectarian and threatening behaviour and breaches of the Offensive Behaviour at Football Act.

Chief superintendent Brian McInulty said: "Overall, both Scottish Cup semi-finals went well over the weekend, with a thrilling atmosphere at the national stadium, Hampden, and good-natured celebrations following the matches.

"On Sunday, there were a number of incidents in and around the stadium and in the city centre where crimes occurred relating to football and relating to alcohol.

"A post-match inquiry is ongoing into these incidents, which includes an investigation into the use of flares, smoke bombs, offensive singing and banners, which could result in additional arrests.

"Our inquiries are not yet complete and there are a number of investigations being carried out in relation to incidents of violence across Scotland and, at this time, it is still to be ascertained whether these incidents are football-related.

"I must thank the majority of supporters who got behind their team, were well behaved and enjoyed two fantastic fixtures over the weekend."

Of the 18 arrested, eight were detained in police custody and have appeared at court.

These included a 54-year-old man for alleged sectarian threatening behaviour and assault, a 22-year-old man for alleged threatening or abusive behaviour and assault and a 29-year-old man for alleged drink-driving and sectarian, threatening or abusive behaviour.

A 38-year-old man also appeared in court for alleged threatening or abusive behaviour and assault, as did two men aged 26 and one aged 31 for alleged offences under the Offensive Behaviour at Football Scotland Act.

A further three men were arrested and released on an undertaking for alleged offences under the act, while seven men were reported to the procurator fiscal for a variety of offences including street drinking and trying to enter the stadium while drunk.