Police are treating an incident in which an assistant referee appeared to be struck by a coin during the Scottish Premiership game between Livingston and Rangers as assault.
Calum Spence, acting as a linesman in front of the Rangers supporters, was hit on the head by an object during Livingston's 1-0 defeat of Steven Gerrard's side at the Tony Macaroni Arena.
Following the incident, the assistant referee received treatment on the touchline for what was described in a police statement as "a minor injury" and he was able to complete the rest of Sunday's game.
Superintendent Craig Smith, event commander for the match, said: "This is a shocking incident and it is not the type of behaviour we have come to expect from football fans in Scotland.