A US-made video, showing German cathedrals turned into mosques and Oktoberfest without alcohol or pork, is being deployed to convince US voters to cast their ballots for Donald Trump.

The mock Isis propaganda video, called "Welcome to the Islamic State of Germany - book your ticket now!", presents a vision of Germany as a place taken over by Islamists.

"Infiltration through Syrian refugees has allowed our brave jihadi fighters to conquer and convert Germany, extending our caliphate," the narrator explains.

The video encourages people to come to Germany, where they can "celebrate the arranged marriages of future jihadists at Oktoberfest."

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