James Tavernier and Djeidi Gassama missed from the spot after an absorbing – if poor quality – contest, allowing Tomas Cvancara the chance to seal a place in the last four after a game in which Rangers dominated.

When his penalty beat Jack Butland, Celtic fans spilled on to the field, followed by Rangers supporters, as police and stewards tried to restore order while projectiles flew through the air.

Police Scotland condemned the “shameful” scenes which they say included “extreme hostility and violence over a sustained period”.

They said some fans were armed with “items intended to cause harm” and that officers and members of the public have been injured and “a number of arrests” have been made.

Both clubs told BBC Sport they will not comment officially yet, but the Scottish FA said “an investigation will be carried out immediately”.

It was an ugly end to an engrossing quarter-final.

Both sides had a goal ruled out in the 90 minutes, with Celtic’s Daizen Maeda having a header disallowed for an earlier offside before Emmanauel Fernandez saw his effort chalked off for handball in extra time.

Rangers dominated for long spells but failed to capitalise on that as Celtic held firm to earn an incredible victory, perfectly executing their four spot-kicks to claim a place in the semi-final draw, later on Sunday.

The headlines, however, will focus on the aftermath. It was horrible to witness and will surely bring consequences.

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