A man has been injured after Rangers fans wrecked a section of Rugby Park where disabled supporters were sat by jumping on its roof.
The incident took place after defender Conor Goldson scored the winning goal in injury-time of their Premiership opener at Kilmarnock.
Police say that four men have now been arrested in connection with the invasion.
After the late-winner scores of fans ran onto the pitch to celebrate while others jumped on top of the sheltered area housing disabled Rangers supporters.
One man was injured when the roof caved in and everyone else in the section, some in wheelchairs, had to be moved to watch the remainder of the game from the side of the pitch.
Rangers won the game 2-1 after Scott Arfield's opener was ruled out by a late Kilmarnock equaliser before Goldson's injury time winner.
Following the game, Police Scotland revealed that four men were arrested on suspicion of breaching the peace following the stoppage-time celebrations.
A spokeswoman for the force said: "An investigation is under way following a pitch incursion at the Kilmarnock versus Rangers match on Sunday.
"The incident resulted in the roof of a shelter collapsing and one man being injured.
"He received medical treatment at the ground and our enquiries are ongoing.
"Four men were arrested in connection with breaching the peace."
Kilmarnock are also investigating after witnesses reported Rangers fans being "crushed" trying to get into Rugby Park due to issues with the turnstiles.
The away end was only approximately three-quarters full at kick-off but, by the dramatic conclusion of the game, Rangers fans could be seen sitting and standing on the stadium's stairs and entrances to the terraces.