No jet skis or pier jumping were involved in the deaths of two children at Bournemouth Beach, Dorset Police say.
The deceased – a 17-year-old boy and a 12-year-old girl – suffered “critical injuries” and died after being pulled from the sea.
Eight other people, also plucked from the waves, were treated for injuries described as non-threatening.
A 40-year-old man has been arrested on suspicion of manslaughter.
The boy, from Southampton, and the girl, from Buckinghamshire, did not know each other.
Dorset Police Assistant Chief Constable Rachel Farrell told journalists there was “no suggestion” of people jumping from Bournemouth pier or of jet skis being involved.
The force earlier confirmed that there was “no physical contact” between a vessel and the swimmers.
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