It's been a particularly shameful week for travelling fans of Glasgow's two biggest clubs, as after Rangers fans felt obligated to apologise after a group of supporters hassled and intimidated a charity worker who was wearing green while collecting Macmillan Cancer Support, a collection of Celtic fans have been publicly condemned by the club today.
Celtic travelled to Sunderland on Saturday where their team made a mockery of the Championship club on the pitch, but they were badly let down after a section of fans were filmed singing a deplorable chant mocking the death of Lee Rigby, a British Army solider who was murdered in a terrorist attack in London in 2013.
The club released a statement promising the strongest possible action against anyone who can be identified in the footage.
Clearly everyone at Celtic is appalled by these events. Such behaviour in no way represents Celtic Football Club or our supporters.
We understand this incident is now subject to an ongoing police inquiry.
Let us be clear, in the event that any individuals are identified as being responsible, Celtic will take the strongest possible action.
While many fans were not behind the club's firm stance on the banners that were displayed against Linfield and their decision to ban the Green Brigade for two matches, the vast majority are likely to support this decision to distance themselves from the small group of supporters who have brought shame to the club in this instance.