Israeli fans were assaulted after a soccer game in Amsterdam by hordes of young people apparently riled up by calls on social media to target Jewish people, Dutch authorities said Friday. Five people were treated for injuries at hospitals and dozens were arrested.

Ahead of the game, large crowds of supporters of the Israeli team could be seen on video chanting anti-Arab slogans as they headed to the stadium, escorted by police.

“Let the IDF win, and (expletive) the Arabs,” the fans chanted, using the acronym of the Israeli military, as they shook their fists. It also showed police pushing several pro-Palestinian protesters away from a Maccabi fan gathering in a square earlier in the day.