FILE - In this undated file photo prisoners at the electric fence of Dachau concentration camp cheer the Americans in Dachau, Germany. German prosecutors say they are investigating a former Nazi concentration camp guard in the Berlin area on suspicion of murder after receiving a tip from the Simon Wiesenthal Center. Spokesman Martin Steltner said Friday, Dec. 13, 2013, that the 87-year-old is alleged to have been involved in killings while serving as a guard at the Dachau camp near Munich. (AP Photo, File)