Germany has barred the makers of a movie about a plot to kill Adolf Hitler from filming at German military sites because its star Tom Cruise is a Scientologist, the Defence Ministry said on Monday.

Cruise, also one of the film's producers, is a member of the Church of Scientology which the German government does not recognise as a church. Berlin says it masquerades as a religion to make money, a charge Scientology leaders reject.

The U.S. actor has been cast as Colonel Claus von Stauffenberg, leader of the unsuccessful attempt to assassinate the Nazi dictator in July 1944 with a bomb hidden in a briefcase.