The bombs discovered in Sheffield city centre today are believed to be German WWII weapons.
The city centre was bombarded by the German air force during the Sheffield Blitz of December 1940.
Here are nine fascinating facts about the German bombing raids on the city...
* The Sheffield Blitz took place over two nights, the 12th and 15th December 1940
* More than 280 German aircraft took part in the raids
* Sheffield city centre was badly damaged on the 12th December raid
* Around 70 civilians who were seeking shelter in the Marples Hotel in Fitzallan Square on the night of the 12th were killed when the building received a direct hit from a 500lb Luftwaffe bomb
* In total 660 people were killed during the two nights of bombing of the city
* In addition to those killed, around 1500 people were injured
* 40,000 Sheffielders were made homeless
* 78,000 homes were damaged
* 3,000 homes were so badly damaged that they had to be totally demolished