The anti-immigrant Alternative for Germany (AfD) party is expected to win 15 percent of the vote in the Sept. 18 election in Berlin, a new poll showed Thursday, a result that would give the party seats in 10 of 16 German state assemblies.

The AfD beat Chancellor Angela Merkel's ruling Christian Democrats into third place in the eastern state of Mecklenburg-Vorpommern on Sunday amid growing discontent about Merkel's decision to welcome about a million refugees over the past year.

A new poll commissioned by German broadcaster ARD showed the party, created in 2013, was poised for further gains in the Berlin election.

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