Police have set up safety cordons and closed beaches between Birling Gap and Cow Gap, near Beachy Head, Eastbourne, after the discovery of several explosive items along the shore.
They are thought to include a Second World War sea mine used to destroy shipping. Members of the public are being warned to stay well away while military Explosive Ordnance Disposal experts deal with the situation.
The devices were reported shortly after 4pm on Saturday (15 June ) and police, coastguards and Royal National Lifeboat Institution personnel have combined to clear the immediate area.
Inspector Alex Campbell, of Sussex Police, said: ” Clearly there is an element of curiosity but these items are potentially very dangerous. I’d ask people to help us by staying well away from the area so that emergency services can work as quickly and efficiently as possible to neutralise any threat.”
No one is reported to have been harmed.