Police have launched an investigation into the events surrounding Wednesday's chaotic Old Firm match.
Rangers players Steven Whittaker, Madjid Bougherra and El-Hadji Diouf were shown red cards in a game that featured 13 cautions and saw Rangers assistant manager Ally McCoist and Celtic boss Neil Lennon share a heated exchange after the final whistle. Lennon and Diouf also clashed on the touchline during the match, which Celtic won 1-0.
A spokesman for Strathclyde Police said: "We have received complaints from members of the public regarding allegations surrounding the events during the Old Firm match on Wednesday, which we are currently investigating."
The events of the Scottish Cup replay at Celtic Park have been roundly condemned by the Scottish Football Association, the Scottish Police Federation and First Minister Alex Salmond.
The police probe comes after the interception of a suspicious package which had been addressed to Lennon.
The item, which was intercepted at a sorting office in Saltcoats, turned out to be a hoax, Celtic confirmed, but Lennon has been given 24-hour surveillance at his home and was accompanied to training on Friday by a security officer.
Earlier in the season the former Northern Ireland international had bullets sent to him in the post.
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