Three family members have died following the incident close to Shoreham Fort.
Chief Superintendent James Collis, of Sussex Police, said a man, a woman and a teenage girl were confirmed dead after emergency services responded to reports.
He added that a younger girl, of the same family, was taken to hospital in a critical condition.
Live updates: https://news.sky.com/story/emergency-services-responding-to-reports-of-four-people-in-difficulty-in-water-off-sussex-coast-13548935
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