NEW : The blast killed a bulldozer driver and at least two other workers at a rubble disposal site . Unexploded World War II - era bombs are still found in Germany decades after 1945 . Bombs are common enough that disposal teams check for them before construction . The blast occurred at a rubble storage site in Euskirchen , Germany , about 30 kilometers ( 19 miles ) southeast of Cologne , police spokesman Helmut Conrads said . Three bomb disposal squad members died in 2004 when a device exploded in Gottingen .
NEW : The blast killed a bulldozer driver and at least two other workers at a rubble disposal site . Unexploded World War II - era bombs are still found in Germany decades after 1945 . Bombs are common enough that disposal teams check for them before construction . Three bomb disposal squad members died in 2004 when a device exploded in Gottingen .