Celtic could face a probe from the SPL and SFA after missiles were thrown onto the pitch at Tannadice in the aftermath of Dougie McDonald’s penalty U-turn.
After having it pointed out to him by one of his assistants, the referee picked up a lighter that was tossed from the stand housing the travelling support, and will include the incident in his match report.
Tayside police claim chestnuts and coins were also lobbed on, and that a number of Celtic fans were ejected.
A spokesman said: “It was a rowdy Celtic support in the stadium.
“Coins were thrown onto the pitch and, bizarrely, a number of conkers landed on the grass.
“The referee will be making a report and police are making further inquiries.”
However, after Neil Lennon’s face-to-face confrontation with fourth-official John McKendrick in the aftermath of McDonald’s decision, which led to the ref being called over to speak to Lennon, it is understood no further action will be taken against the manager.