Shock moment Celtic & Rangers ultras clash as terrified Christmas shoppers left petrified by pyro in doorway

THIS is the shocking moment that saw Celtic and Rangers ultras clashing in Glasgow city centre ahead of the Premier Sports Cup Final.

The footage – seemingly shot from within the HMV store on Argyle Street – shows Christmas shoppers forced to take shelter as a large number of fans run past, with a heavy police presence and PYRO being lit right in front of them.