Watch: Crowd trouble at National Stadium during last night's game between Northern Ireland and Croatia
One brawl took place under the North stand at half time and footage filmed by Bradley Blaine has been shared widely on Facebook.
It showed goading between home and away fans before a brief skirmish between supporters.
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Hide AdElsewhere in the ground one of our reporters observed an altercation as Croatian fans were ejected from the West stand.
Police confirmed Croatian supporters were removed from the stadium but no arrests were made.
PSNI Inspector Gavin Kirkpatrick said: “Police escorted a number of visiting supporters away from the National Stadium after they were removed from the stadium by security staff. No arrests were made and the supporters dispersed peacefully.”