Celtic and Rangers fans have clashed during a pitch invasion following an Old Firm match at Ibrox. Fans of the Parkhead side initially spilled onto the pitch in celebration after a 4-2 win on penalties. But scenes turned ugly as Rangers fans joined the fracas, with flares thrown and police and stewards forming a barricade between the two sides.

The disorder quickly settled down with fans returning to the stands. It was the first time Celtic supporters have been given the full Broomloan Stand allocation at Ibrox since it was reduced to fewer than 1,000 in 2018. Traditionally, around 7,500 Celtic fans filled the stand for Old Firm derbies. Since then, away allocations at both Ibrox and Celtic Park have fluctuated between about 750 and zero in a series of tit-for-tat moves.

A spokesperson for the Scottish Football Association said: "The Scottish FA condemns the behaviour from supporters entering the field of play following today's Scottish Gas Scottish Cup Quarter-Final at Ibrox Stadium. An investigation will be carried out immediately in line with the judicial panel protocol."

Both clubs told BBC Sport they will not comment officially yet. In a post-match interview, Celtic manager Martin O'Neill said: "You're asking me a lot of political questions in this moment when I'm in a euphoric state. The fans have spilled over, big scenes at the end, all over the place. I'm not diminishing it at all, I will have a think about it and speak to you in due course."

Meanwhile Rangers head coach Danny Rohl told Premier Sports: "I'm not sure what was at the end, I was in the tunnel."