There were ugly scenes after the draw between Ballymena United and Lisburn Distillery as referee Mark Courtney had to be escorted off the field by police.
There were ugly scenes after Saturday's draw at the Showgrounds
Courtney and his assistants waited on the pitch for almost 15 minutes while police vehicles surrounded the pitch.
Managers Tommy Wright and Paul Kirk had to be kept apart after squaring up and players were also involved in jostling.
A chair, a bottle and a leg of lamb are all believed to have been thrown toward the pitch by angry Ballymena fans.
The match was a lively affair, with Nathan McConnell scoring an equaliser for Distillery in the ninth minute of added time after United had been reduced to nine men.
United fans are believed to have been angered by the display of referee Courtney, whom they believe should have dismissed Whites goalkeeper Philip Matthews, as well as the two Ballymena players.
They also claim that Whites players made a number of inflammatory gestures towards the United support and did not return the ball to Ballymena after home goalkeeper Paul Murphy had received treatment for an injury.
Jostling at the final whistle appeared to continue in the tunnel area and disciplinary action is likely after the IFA's Disciplinary Committee study the referee's report.