Warning signs have been put up on Dovercourt beach near Harwich to warn members of the public about unexploded hand grenades.
A decision on whether a section of the beach will be closed is due to be taken this afternoon.
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Rain easing for a time, but heavy showers possible later.
22 Albatross boats, glamorised by the likes of Brigit Bardot and Prince Rainier, are sailing in Norfolk and Suffolk this weekend.
Risk of heavy rain overnight and later Sunday.