Windows in residents' homes were smashed after a World War Two bomb was detonated in a controlled explosion.
The device was found on a building site in Kingston, southwest London, on Thursday morning, causing 1,500 homes to be evacuated.
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Experts from the Ministry of Defence were called in after the bomb had been examined by specialist police officers.
Two polling stations - opened for the European elections - had to be closed, with voters directed to other sites.
The device was safely detonated at about 4pm on Friday.
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Andrew Horn tweeted: "Wow that was loud...the Kingston Bomb has just been detonated...my desk is a mile away and it made me jump!"
Burci Baci said there was a "very loud blast and reverberations were felt", adding: "All the birds flew out the trees, followed by loud cheers and celebrations heard afterward!"
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It has since emerged that there was damage to nearby homes when the device went off.
Rachel Major tweeted that she was "waiting to get my window boarded up".
Brandon Mitchell said most people had been able to return to their homes after the blast, "except for a few unlucky on Fassett road".
His tweet showed both upstairs and downstairs windows shattered.
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On a lighter note, Kingston Police tweeted a picture of the crater left by the explosion, and said they were "looking into it".