Six-metre-high fences are a solution to stem a record influx of refugees to Germany, the co-president of populist party AfD tells a rapt audience at a campaign rally ahead of Sunday's regional elections.

"Of course fences would help" stop more migrants from arriving, said Joerg Meuthen, emphasising his party's position that is directly opposed to Chancellor Angela Merkel's liberal refugee policy.

With misgiving growing in Germany over the 1.1 million asylum seekers who arrived in 2015 alone, the AfD is projected to scoop up protest votes during regional elections in three states on Sunday, potentially even becoming a third political force in some of these places.

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