Watch: Shocking footage of Rangers fans destroying Celtic Parkhead toilets while singing 'Billy Boys'
*** Warning footage contains offensive material ***
A video has emerged of Rangers fans destroying the toilets at Celtic's Parkhead stadium during Saturday's Old Firm game.
Saturday's midday game - the first in the league between the two Glasgow clubs since Rangers demotion - saw Brendan Rodgers' men romp to an impressive 5-1 triumph.
But the match has been overshadowed by events among the crowd.
Underneath a banner reading, "This is it Bhoys, this is war", two blow-up dolls - one wearing a Rangers scarf, the other an Orange sash - with rope wrapped round their necks and their arms tied behind their back were strung up from the upper tier.
As well as the effigies, the home fans unveiled a banner which read "Know your place Hun scum" while the Rangers fans were heard chanting the banned Billy Boys song.
Celtic, meanwhile, have also launched an investigation after a toilet in the area housing the away support was trashed.
A video has emerged showing those attending the game in the toilets.
The large crowd are heard chanting the Billy Boys while attacking the toilets. At one stage a section of the wall comes down on those within.
As well as the banned song, some among the crowd shout obscenities.
Since the video was posted on social media it has been watched over 1million times.