ATHENS, Greece -- Greek authorities have brought indecency charges against a U.S. national who allegedly pranced naked at a prominent Athens war memorial following an anti-austerity protest outside Parliament.

The 56-year-old man, who was not identified, was arrested late Tuesday in the aftermath of a 50,000-strong rally during a visit by German Chancellor Angela Merkel.

A video posted online showed a stark naked man in his fifties talking to presidential guards at the Unknown Soldier's Tomb in front of Parliament, which had been fenced off for the protest. Police officers first remonstrated with him and, when he carried out a little jig, cheered on by a few remaining protesters, led him away.

Earlier, another man performed a naked streak among stunned riot police during clashes with demonstrators. He escaped arrest.

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  • A naked demonstrator flashes the victory sign while running in Athens during a demonstration against the vist of the German Chancellor Angela Merkel on October 9, 2012. (ARIS MESSINIS/AFP/GettyImages)

  • Demonstrators hold a banner in front of the parliament during a demonstration against the visit of the German Chancellor Angela Merkel on October 9, 2012. (LOUISA GOULIAMAKI/AFP/GettyImages)

  • A protester holds a plackard of German Chancellor Angela Merkel featuring a Hitler moustache near the Greek parliament in Athens during a demonstration against the vist of the German Chancellor Angela Merkel on October 9, 2012. (LOUISA GOULIAMAKI/AFP/GettyImages)

  • A naked demonstrator runs in Athens during a demonstration against the vist of the German Chancellor Angela Merkel on October 9, 2012. (ARIS MESSINIS/AFP/GettyImages)

  • Two men dressed as German World War II soldiers with Nazi swastika armbands sit in the back of an open vehicle during a protest in Athens on Tuesday Oct. 9, 2012. (AP Photo/Dimitri Messinis)

  • Two men dressed as German World War II soldiers with Nazi swastika armbands sit in the back of an open vehicle, in front of a banner reading "Merkel out, undesirable" during a protest in Athens on Tuesday Oct. 9, 2012. (AP Photo/Lefteris Pitarakis)

  • A nude protestor runs during clashes in front of the parliament in Athens, Tuesday Oct. 9, 2012. (AP Photo/Lefteris Pitarakis)