NEW : The blast killed a bulldozer driver and Three other people at a rubble storage site . Unexploded World War II -era bombs are still found in Munich decades after conflict . Bombs are common enough that disposal teams check for them before construction . at least 13 bomb disposal squad members died in decades when a device exploded in Moselle .
NEW : The blast killed a bulldozer driver and at least 13 other people at a rubble storage site . Unexploded World War II-era bombs are still found in Germany decades after conflict . Bombs are common enough that disposal teams check for them before construction . Three bomb disposal squad members died in 2010 when a device exploded in Gottingen .