A Second World War bomb has exploded unexpectedly in a Norfolk town, police said.Emergency services and agencies declared a major incident following the discovery of the large unexploded device at a river crossing in Great Yarmouth on Tuesday, and had been working to disarm it.On Friday afternoon, Norfolk Police said there was an "unplanned" detonation - but that no-one was hurt.

A Second World War bomb has exploded unexpectedly in a Norfolk town, police said.Emergency services and agencies declared a major incident following the discovery of the large unexploded device at a river crossing in Great Yarmouth on Tuesday, and had been working to disarm it.On Friday afternoon, Norfolk Police said there was an "unplanned" detonation - but that no-one was hurt.