Police Scotland are investigating a banner displayed by Rangers supporters ahead of the Scottish Premiership match against Celtic.
Fans in the Copland Stand at Ibrox took part in a display depicting Graeme Souness holding a shotgun - inspired by a real photograph of the former Rangers player and manager.
The display also featured the words: "Take aim against the rebel scum".
The image of Souness was based on a photo-op of the former Scotland internationalist holding a shotgun during a photo-op in Malaga, Spain ahead of the World Cup in 1982.
Now, though, Police Scotland officers are carrying out enquiries over the display at Ibrox on Sunday.
A Police Scotland spokesperson said: “We are aware of the banner and enquiries are ongoing.”
The banner is being held by Police Scotland while investigations into the matter are being carried out.
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Rangers condemned the tifo as it was branded "unacceptable" with an admission it "crossed a line".
"We also acknowledge that the tifo displayed prior to kick-off crossed a line and was unacceptable," a Rangers club spokesperson said.
"Our approach to supporter displays has always been built on trust, with the responsibility placed on groups to exercise good judgement.
"We will reflect on how these displays are managed and engage with supporter groups to ensure the right balance of trust, responsibility and oversight is maintained moving forward.
"Rangers is proud of its passionate fanbase, and we all share a duty to protect the standards and reputation of our club."
