Authorities in the southeastern German city of Regensburg have evacuated a prison after discovering an unexploded bomb from World War II, the AP reports. More than 100 prisoners were taken to an undisclosed location on Saturday. Some 1,500 residents living in nearby houses were also ordered to leave their homes so specialists could begin defusing the 496-pound aerial bomb, which was found within yards of the prison during a construction project Wednesday. Unexploded bombs are regularly discovered in Germany even 72 years after the end of WWII. (More bomb stories.)