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 an 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 weapon before work resumed, a 2012 official said.
An Olympic Delivery Authority spokesman said: "A small Second World War incendiary device, weighing around a kilogram, 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."