Gosport police reported that ‘four or five shells’ had been discovered at the Explosion Museum of Naval Firepower on June 29.
Residents had been warned to stay clear of the site, on Priddy’s Hard, and Heritage Way, which leads to the museum.
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Officers have reopened Millennium Bridge and now declared the area safe after an inspection by a bomb disposal team.
In a statement on social media, an officer wrote: ‘(Explosive Ordnance Disposal team) have attended and made safe the shells. Thank you to you all for your patience throughout.’