North Norfolk coastguard teams were alerted to suspicious devices this week on Brancaster beach.
On Monday coastguard rescue teams assessed and photographed two objects near Scolt Head Island and sent their findings to the bomb disposal team.
A controlled explosion of the two objects, likely to have seen Second World War ordnance, was carried out yesterday, according to operation officer at Humber Coastguard, Ryan Douglas.
He added a third suspicious object was spotted 'in the fading light' yesterday, but a search carried out today was unsuccessful.
Mr Douglas said the item had probably been covered with sand overnight.
He said there was a lot of Second World War and First World War ordnance along the coast and, although not regular, it was not unusual to find it.
He added the public should call 999 and ask for coastguard if they spotted a suspicious-looking item on the beach.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here