Two 500lb unexploded wartime bombs have been discovered close to the site of a wind farm off the coast of Sussex.
An exclusion zone has been set up three miles off Shoreham with marker buoys in place near E.On's £1.3bn Rampion wind farm.
The devices were found close to one another within the parameters of its offshore site, the energy firm said.
A spokesman added that safety remained its highest priority and experts were determining the best course of action.
"Local people should not be concerned and offshore construction is unaffected by this find," a statement added.
Sailors and fishermen in the area have been advised to observe a 500-metre safety zone until the ordnance has been "retrieved or disposed", E.On said.
The Maritime and Coastguard Agency said they were not aware of the incident, but "as a commercial company E.On would deal with the ordnance itself".
The Rampion wind farm has been under construction since last September will have 116 wind turbines when it is completed next year.