26 July 2012 Last updated at 03:32 ET

WWII bomb found at Sheffield's greyhound stadium

The incendiary device was discovered by workmen whilst performing maintenance work

A World War II bomb was unearthed at a dog racing stadium in Sheffield and driven across the city by workmen who did not realise what it was.

Sign fitters found the "unidentified object" while digging up an area at Owlerton Greyhound. It was picked up and put in a van.

Once back in the office, colleagues raised their concerns with the police.

The Army was called to carry out a controlled explosion on the incendiary device, believed to be from the 1940s.

Managing director of the stadium, John Gilburn, said: "It certainly brings a whole new different light to the meaning explosive atmosphere for the greyhound stadium."

The device is believed to be from an armoured personnel carrier, but how it got there is unknown.