Police say a drunken American man was punched by a passer-by as he gave the stiff-armed Nazi salute multiple times in downtown Dresden.
The American also had insignia of "unconstitutional organizations, which includes Nazi symbols", Deutsche Welle reported.
The American was detained by German police.
The U.S. tourist was slightly injured, the report said, adding that a test by the police showed that the Hitler-salute giver had alcohol blood level of 0.276 percent. He is wanted for questioning by Dresden police.
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The incident came just a week after two Chinese tourists landed in trouble, when they were caught taking photos in front of the iconic Reichstag in Berlin, while demonstrating the prohibited Nazi salute.
While residents of Germany and Austria, as well as many of their European neighbors, are educated on the laws forbidding Nazi symbols and expressions, it's not clear if Chinese tourists are aware of the post-1945 statutes.
That's this weekend's object lesson from Germany, a nation that knows a thing or two about Nazis. Earlier this month, Switzerland's Supreme Court upheld the conviction of a man who appeared in 2013 photos making the Nazi salute outside a Geneva synagogue. "Don't do it anywhere in fact".