Derby County boss Steve McClaren was upset with the multiple pitch invasions during their 1-1 draw against Championship rivals Nottingham Forest.
Seven fans were arrested during the heated clash as both Rams and Forest fans entered the field of play during the second half.
McClaren felt his side were on top during the second 45 minutes until the break in play halted Derby's progress.
He told the Derby Telegraph: "It was difficult because we had started the second half well. We were more aggressive. We did not make the most of our opportunities. In the end chaos reigned and we came away with a point.
"I don't know what was happening with the break in play. It was handled poorly. Things seemed to go against us, when it came to decisions and moments. But we stuck in there and that is the character we will need this season.
"The players handled the occasion very well. We are pleased with that."
