Bomb disposal experts were called to Blyth after two old ammunition shells were found on the beach.
Police received a report of two Second World War motar bombs having been found on the beach at Links Road at 11.41am on Sunday, April 28.
Officers and the coast guard attended and marked the area where the items were found as the tide had come in.
The following day, Monday, April 29, the Army bomb disposal unit attended to make the devices safe.
An Army spokesman confirmed two 3.5in shells thought to be artillery or naval were found on the beach.
“The bomb disposal men carried out a controlled explosion on the beach,” he said.
“Whoever reported it did the right thing, and we would urge anyone who finds anything similar not to pick them up and to contact us.”