Roads were closed for hours in the city centre today after World War Two munition was found on a Sheffield building site for the second time in a week.
South Yorkshire Police believe the device found on Matilda Street this morning was an unexploded tank shell.
The tank shell was discovered five days after the discovery of what are believed to be three artillery shells in the same area.
Builders found the devices while demolishing buildings in order to start the construction of 103 new student flats.
Alf Mezulis, project manager for Bardsley Construction, said the object was slightly bigger than the ones he and his team found last Wednesday.
Shortly after 9.30am police told the builders to clear the site before closing a 300 metre section of Matilda Street, as well as the intersecting side roads, Eyre Lane and Arundel Street.
A bomb disposal squad was called to the scene after the police liaised with the military Explosive Ordnance Disposal Unit.
Sheffield was vulnerable to attacks in World War Two due to its munition factories in the east of the city.
Motorists in the city centre were told to expect traffic disruption near Matilda Street and asked by police to ‘plan alternative routes where possible’.
One policewoman allowed people underneath the cordon to collect their cars from Matilda Street car park, adjacent to the building site, because it would not be good 'to bring petrol to the party' if the device exploded.
Mr Mezulis said he hopes no more devices are found so that he and his team can get back to work.