A double-digit score for the anti-immigrant Alternative for Germany (AfD) in a Berlin city vote on Sunday would be seen around the world as the rebirth of the Nazis, the mayor of the German capital has warned.

The right-wing AfD has gained support as voters become increasingly uneasy with Chancellor Angela Merkel's open-door refugee policy, which saw about one million migrants arrive in Germany last year.

A poll by Forschungsgruppe Wahlen for broadcaster ZDF that was published on Thursday showed the AfD was set to get 14 percent in the weekend vote in Berlin, historically a left-wing stronghold.

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