As time ticks down to the Olympic Games, workmen were forced to come to a standstill after discovering a Nazi bomb left over from the Blitz.
Officials said work stopped briefly on Wednesday after a small incendiary device was found on the east London site.
An ordnance expert found the 1kg device at the site for temporary basketball training courts in Leyton Marshes.
Bomb disposal experts from Scotland Yard got rid of the unexploded ordnance before work resumed, a 2012 official said.
An Olympic Delivery Authority spokesman said: "A small Second World War incendiary device, weighing around a kilogramme, was safely removed yesterday from the site of a temporary Games-time basketball training venue on Leyton Marsh.
"A routine scan of the site in early February detected metal underground and because of this an ordnance expert was appointed to oversee the start of works.
"Police were immediately contacted after the device was discovered and it was later removed by specialist officers.
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"At no time were nearby people or property put at risk and work has now resumed on site."
A Metropolitan Police spokesman said: "Police were called to Leyton Marshes to reports of a suspected unexploded Second World War bomb being discovered at the site.
"The area was cordoned off and the site evacuated as a precaution, whilst EOD (explosive ordnance disposal) officers made the bomb safe."