THE HAGUE, Netherlands — Dozens of people armed with sticks and firecrackers set fire to a tram in Amsterdam on Monday, police said, as the city faces tensions following last week’s violence. Targeting fans of an Israeli football club..

Police said the fire was quickly extinguished and riot officers cleared the square. Images online showed people damaging property and setting off firecrackers.

Police said it was unclear who started the riot and whether it was related to what happened last week. But they noted the tense atmosphere since five people were treated in hospital and dozens were detained on Thursday after a match between Maccabi Tel Aviv and Ajax. Youths on scooters and on foot went in search of Israeli fanatics, beating and kicking them and then fleeing to evade police, according to Amsterdam’s mayor.

Dutch police announced five new arrests Monday in their investigation into that earlier violence. The suspects are men between 18 and 37 years old and come from Amsterdam or surrounding cities. Four remain detained; the fifth has been released but remains a suspect.

Earlier, police said four other men who had been arrested last week would remain in custody as the investigation continues. Two of them are minors, one 16 years old and another 17 from Amsterdam. The other two men are from Amsterdam and a nearby city.

Police said they have identified more than 170 witnesses and taken forensic evidence from dozens.. Premier Dick Schoof said they were also examining videos posted on social media.

Reports of anti-Semitic speech, vandalism and violence have been increasing in Europe since the start of the war in Gaza, and tensions rose in Amsterdam ahead of Thursday night’s game.

Local authorities prohibited pro-Palestinian protesters from gathering outside the stadium. Before the match, Maccabi fans also tore down a Palestinian flag from a building in Amsterdam and chanted anti-Arab slogans on the way to the stadium. There were also reports of Maccabi fans starting fights.

The mayor banned all demonstrations in the city and declared several parts of Amsterdam risk zones where the police can stop and control anyone. d Ozens were arrested on Sunday. for participating in a pro-Palestinian demonstration in the center of Amsterdam that had been outlawed.

Israeli Foreign Minister Gideon Saar On Friday he rushed to the Netherlands and offered Israel’s help in the police investigation. He met with the Dutch prime minister on Saturday and said in a statement that the attacks and demands to show passports were “reminiscent of dark periods in history.”