Local media says detainees are supporters of AZ Alkmaar who were at metro station on way to match against Jewish-associated club Ajax Amsterdam

Vitesse boss condemns 'small group' of supporters responsible; Amsterdam-based Ajax is known for its history of Jewish supporters

Passengers on train heading from parade hear ditty about Amsterdam's Ajax supporters, sometimes called Jews; anti-Semitism watchdog calls incident 'stupid beyond words'

Marco van Basten says he was trying to 'explain' presenter's German interview when he remarked 'sieg heil,' sparking outrage as country grapples with racism surrounding pitch