Brondby fans allegedly hit a pitchside photographer with a missile during their Europa League clash at Ibrox.
Tempers in the away end flared around half-time as the Danish champions trailed Rangers 2-0.
Leon Balogun's header gave the home side the lead before Kemar Roofe tapped home the second, following a lengthy yet correct VAR review.
That result would leave Brondby rock bottom of the group and a sizeable away following seemed to turn nasty as the game went on.
On BT Sport's coverage, host Darrell Currie told viewers that a snapper was "hit by a coin" in the chaos.
He also claimed some of the yellow and blue clad supporters has tried to climb over the netting designed to segregate home and away supporters.
An increased stewarding and police presence moved in to keep an eye on the section in the second half.
And UEFA's delegate present at the game, Targo Kaldoja, will doubtlessly have been keeping an eye on the situation in case sanctions against the Superliga side are necessary.
Before the match, Brondby fans took over George Square before marching towards Ibrox, accompanied by the police.
