Amsterdam - All football games between Ajax and Feyenoord will be played without supporters of the visiting club for the next five years, Dutch media reported on Thursday.
The Amsterdam and Rotterdam mayors, the management of both football clubs and the national football association KNVB made the decision Wednesday night after a number of violent incidents had taken place last week.
The KNVB said the ban will be evaluated after two years, and could theoretically be shortened then.
Matches between Amsterdam-based Ajax and Rotterdam-based Feyenoord, traditionally known as the "classic duel", are notorious for their many incidents involving violence and vandalism.