Authorities in Argentina are concerned over a secret rock concert that neo-Nazis staged, according to the French news agency French news agency AFP. "The reasons behind this are of concern because of what it signifies, and what motivates these kinds of people," said Justice Minister Anibal Fernandez.
One neo-Nazi website said the concert was held to commemorate the birthday of Adolph Hitler on Sunday, which also was the first day of Passover. The location of the concert was kept secret.