Clashes broke out inside Greece's Olympic Stadium ahead of a Champions League match between AEK Athens and Ajax Amerstdam on Tuesday night.
The two sides met in a Group E match in Athens but the build up to the game was marred by violence in the stands.
Fans reportedly threw flares and a missile or petrol bomb which exploded close to Ajax supporters.
*Watch the video here-
Riot police were deployed to deal with the trouble as a fire raged inside the stadium following a shocking explosion ahead of the early kick-off.
No arrests or injuries were reported, although photos showed several supporters with blood on their face following the clashes.