"An investigation is still being conducted on possible warning signs from Israel," Van Weel said in his letter late on Friday evening.
Dutch Jewish community aids stranded Israelis amid pogrom in Amsterdam.
An alleged "Jew hunt" was announced well in advance in the messaging app Telegram, prompting rioters to travel from far outside Amsterdam to attack Israelis.
Israelis describe the physical violence they faced in Amsterdam, and the story of two Chabad rabbis who helped those in need.
France has prepared a plethora of precautions to protect Israeli fans.
The question is whether the mayor can weather this storm, when even the vehemently non-political Dutch king spoke out against the violence in the streets of his capital.
Chabad collected wounded Israelis across Amsterdam, delivering them to a safe shelter and offering them a place for Shabbat.
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