The players were forced to leave the ice and return to the locker rooms, while away fans were forced to leave the stands.
"At events like this, we follow predetermined protocols, and when there are pyrotechnics, that section must be emptied," head referee Kristoffer Folkstrand tells TV4.
"I hope those who behave themselves are allowed back in anyway," Folkstrand says.
The match is now underway - around 15 minutes later than planned.
"It shouldn't affect us at all," Brynäs coach Niklas Gällstedt tells TV4.