BERLIN (Reuters) - The German Defence Ministry is investigating an amateur video clip of a German army instructor ordering a recruit training with a machine gun to imagine he is firing at "African Americans" who are insulting his mother.

German television networks on Saturday aired the video clip.

"You're in the Bronx, a black van pulls up in front of you and three African-Americans get out and start really insulting your mother ... now do something!" the instructor says in German while a recruit lying on the ground starts firing his gun.