“Officers are out in the area today offering reassurance to local residents and I would like to reiterate that incidents of this nature are extremely rare, " added Det Insp Andy Howard.
"At this time we believe this to be an isolated incident.”
Anyone with information can contact Det Insp Howard on 101.
If you don't want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.
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Friday morning's weather for the East of the region
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Five men who died in the water off Camber Sands were friends who had arrived to spend the day at the beach together, ITV News understands.