Police say they are studying CCTV footage from a football ground where three fans were arrested at a youth cup final between Glasgow rivals Rangers and Celtic.
Last night's Glasgow Cup under-17s fixture at Firhill, the home of Partick Thistle FC, was the first meeting of the Old Firm since Rangers were liquidated and effectively relegated to the Third Division.
Kick-off was delayed as supporters set off flares and smoke bombs and damaged seats in the stands. Some fans also invaded the pitch.
Graham Spiers on the Old Firm's delinquent youth
Police Scotland said three arrests were made at the game which Rangers won 3-2.
Two 17-year-old boys were arrested inside the ground over an alleged pitch invasion and a 19-year-old man was arrested outside the stadium in connection with a minor assault.
A report will be sent to the procurator fiscal.
About 6,000 people attended the match.
Both clubs say they are helping police with their investigation.
A Celtic spokesman said: "We are looking into last night's match in more detail, together with all the relevant authorities, and clearly will deal with any issues appropriately."
A Rangers spokesman said: "It is disappointing that the off-field incidents at the Glasgow Cup Final last night detracted from a good game of football and a terrific result for the Rangers under-17 team. The club will assist the police with all their inquiries."
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