Supporters from both ends of the stadium poured onto the pitch at Ibrox in shocking scenes at the end of the Scottish Cup tie between Rangers and Celtic.
Martin O'Neill's side claimed victory by a 4-2 margin in a penalty shoot-out after a goalless draw after 120 minutes of action at Ibrox.
However, disgraceful scenes broke out after full-time as both Celtic and Rangers supporters invaded the pitch and clashed before police and stewards could contain the chaos.
After the shoot-out, Celtic fans had jumped barriers to celebrate the victory as they pushed past stewards and police to invade the pitch.
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Rangers supporters from the opposite Copland Stand retaliated by entering the pitch as officials looked to block chaotic scenes breaking out between rival fans.
Furious scenes were stoked further when a Celtic staff member was reportedly attacked.
Flares and objects could be seen being thrown between Celtic and Rangers supporters as police officers began to form lines between the rival factions.
The trouble came as Celtic had an increased allocation at the derby clash through Scottish Cup rules. Instead of the five per cent allocation, the visitors had the full Broomloan Stand with around 7,500 inside Ibrox.
A Scottish FA statement read: "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."
Celtic boss O'Neill said: "It looked as if there was a few tete-a-tetes as much as anything else.
"That is unfortunate, but hopefully, it does not dilute the performance in terms of character and all the things that we had."
On fan behaviour overshadowing the match, he added: "That may well be. I need to have a think about it. Really at the end of the day, Old Firm games are explosive. They have always been and maybe that is one of the reasons that the derby is one of the best in the world."
Rangers manager Danny Rohl commented: "I'm honest, I was not on the pitch at this moment. I didn't see it until now.
"I heard just that there was something on the pitch. I think we all know the emotional situation after a game. Nobody likes to see this.
"I think it was a great atmosphere, 120 minutes. I think it should be like this. All the other things should not be in the stadium or around football."
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