Families have been urged to stay clear after construction workers at the third river crossing in Southtown Road in Great Yarmouth found the alleged explosive at 11.36 am today.
Police are advising residents to leave the area with with officers go to door to door clearing a hundred homes within the cordon.
The suspected bomb was discovered during dredging operations in the River Yare at Bollard Quay, not far from the intersection with Boundary Road.
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