German President Joachim Gauck joined a Ramadan dinner on Monday, warning against demonizing Muslims a day after a man pledging allegiance to Islamic State shot dead 49 people in a U.S. nightclub.

Germany is at the front line of efforts to integrate migrants into Europe after more than 1 million arrived there last year, most of them Muslims fleeing war and poverty in the Middle East, Africa and elsewhere.

The influx has raised tensions in German society. Refugee shelters have been attacked and the anti-immigration Alternative for Germany (AfD) party has become a political force, describing Islam as incompatible with the constitution and calling for a ban on minarets and the burqa.

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