Six people were detained at a pro-Turkey protest in Amsterdam that turned violent, Dutch police said Monday.

Protesters were angry at Dutch authorities for barring the Turkish foreign minister from flying into the city of Rotterdam on Saturday to address a rally at the Turkish consulate.

A second Turkish minister who travelled to Rotterdam by car from Germany was later blocked from entering the consulate and escorted back to the German border.

The demonstration Sunday in Amsterdam by a few hundred Turkish-born Dutch residents turned violent in the evening, when protesters began rampaging through the streets and hurling stones at police.

Police responded by using water cannon and batons on the protesters.

It was the second night of unrest after several people were detained at a protest in Rotterdam on Saturday night.

The Dutch Foreign Ministry warned Monday that given the heightened state of tension, Dutch citizens in Turkey should be vigilant and avoid large crowds. However, travel to Turkey was not discouraged.

A spiralling feud between Turkey and Europe over the political rallies, which are aimed at boosting support among Turks living abroad for a constitutional referendum next next, escalated into a diplomatic crisis over the weekend.

Turkey's Foreign Ministry summoned the Dutch charge d'affaires in Ankara for a third time in as many days, and is demanding a formal written apology from the Dutch authorities over the treatment of its two ministers.

Dutch Prime Minister Mark Rutte has ruled out any apology.

Turkish President Recep Tayyip Erdogan called the Dutch government "fascists" and "Nazi remnants" for blocking the rallies.

He has accused the German government of acting like Nazis for similar decisions to ban the campaign rallies on security grounds.

German Interior Minister Thomas de Maiziere criticized the Turkish rallies, saying on Sunday that "there is no reason for an election campaign (in Germany)," according to remarks made to public television channel ARD.

"We don't want the situation to escalate," Finance Minister Wolfgang Schaeuble told public television ZDF. "Everyone in the federal government agrees with that. We just want Turkey to return to reason."

Austria and Switzerland have also taken action against the rallies.

A similar rally in France was allowed to go ahead.

The Turkish government is pushing for a "yes" vote in the April 16 referendum and has been targeting the millions of expatriate voters living in Europe as part of its campaign. If it passes, the powers of Erdogan's office would be greatly expanded.

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