Austrian police have arrested four masked youths who allegedly injured two French visitors to a former Austrian concentration camp - one of whom was a Holocaust survivor - with pellets fired from a plastic gun, an official said Monday. The youths - all local males aged 14 and 16 - confessed that they shot at the French visitors to "scare" them, said Alois Lissl, director of security in Upper Austria province. He said they also admitted shouting "Heil Hitler" and "Sieg Heil" at an Italian group visiting the camp but said were not believed to be members of a neo-Nazi group. Lissl said the youths would be allowed to go home Monday night. No decision on charges will be made until an investigation is complete, he said.