A section of Rangers supporters were blasted in their side's Old Firm clash with Celtic after shards of broken glass and bottles were thrown onto the pitch at Ibrox.
The start of the second half was delayed in the pivotal match concerning the Scottish Premiership title after glass was found in Joe Hart's penalty area while the home side were trailing 2-1 in their eventual defeat.
Hart had complained to referee Willie Collum after returning to the pitch from the dressing room following the interval.
The former Tottenham and Manchester City keeper and a team of stewards carefully inspected the box for more debris that had been thrown by spectators during the encounter before play could resume.
Former Celtic striker Chris Sutton was among those who hit out at the culprits responsible for the highly dangerous acts that threaten the safety of players from both sides.
Sutton said on Twitter: 'Absolute scumbags throwing glass bottles on to the pitch. How low can some people go. This is how this game will be remembered now.'
Sutton's criticisms were echoed by Sky Sports commentator and former Bhoys forward Andy Walker who called the scenes 'shameful'.
While Gers legend Ally McCoist described fans' behaviour as acting with 'gross stupidity'.
Coins were then also seen to be thrown on the pitch at the start of the second half.
Rangers had taken the lead in the third minute through Aaron Ramsey's strike, only for Tom Rogic to hit straight back for the Bhoys just four minutes later.
Celtic then turned the game on its head two minutes before the break when Cameron Carter-Vickers found the net, with the visitors holding on for a crucial win that extends their lead at the top of the table to their rivals to six points.
The incident come weeks after Rangers fans also caused a previous meeting with Dundee to be stopped on three different occasions back in March.
Reacting to plans of a friendly against Celtic in November in the Sydney Super Cup, supporters had bombarded the pitch at Dundee with toilet rolls and tennis balls.
A banner reading: 'You'll jump into bed with Glasgow Celtic' piled the pressure on the Rangers board to find a loophole in the contract with organisers during a 2-1 win at Dens Park.
Van Bronckhorst had said after the win: 'Of course it's disruptive because you want to play the game.
'We had three or four breaks because of the cleaning up. So it's a disruption but I know there are emotions.
'To show their emotions is good to see, but you need to have the balance. It was disruptive for us today. I understand the emotions of the fans but we will go back with three points in our bag.'