Homes were evacuated after the bomb squad was called to an Ipswich street.
Suffolk police were called by a resident on Lindbergh Road in Ipswich on Monday, after builders at the house dug up a Spigot Mortar.
Following the call, a cordon was put in place on surrounding roads, with residents evacuated.
Specialists from the 11th Explosive Ordnance Disposal and Search Regiment, based in Colchester, attended the address and removed the mortar.
The spigot mortar was an anti-tank weapon used by the army in the early years of Second World War.
The specialist regiment determined that the mortar was not live once they had removed it from the area.
Suffolk police then removed the cordon at around 1.30pm.
Last month, a road was closed for several hours after a bomb was found in Ipswich, near the Suffolk Food Hall.
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