Croatia boss Ante Cacic has called the supporters who threw flares on to the pitch in their Euro 2016 draw with the Czech Republic “sports terrorists”.
The match, which ended 2-2, was halted in the 86th minute when flares from the Croatia end rained down on the Saint-Etienne pitch.
Uefa has confirmed it will investigate the incident.
“They are not really Croatia supporters. These people are scary and I call them hooligans,” said Cacic.
Croatia have already been charged by Uefa after crowd trouble in their opening Group D game against Turkey.
Uefa said disciplinary proceedings would be opened on Saturday once they had received the official reports about the trouble from the match delegate and English referee Mark Clattenburg.
Cacic also hopes the Croatian FA will take action, adding: “The 95% of Croatian supporters are ashamed in front of Europe.
“These are sports terrorists. This is maybe just a question about six to 10 individuals. I hope they can be identified and punished. I hope the Croatia FA is doing everything to prevent this, but it is impossible to avoid.”
Uefa is also expected to open disciplinary proceedings against the Turkish FA after some of the country’s fans set off flares at the end of their 3-0 defeat by Spain in Nice.
Before that game, three Spanish “ultras” fans were arrested for trying to bring flares into the stadium, while another three were arrested for carrying neo-Nazi banners.