Vitoria Figueiredo Barreto, 30, had been visiting a friend and staying at her home in Southend, Essex, when she went missing on March 3.
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The figure, revealed by Reuters on Tuesday, is far higher than the Pentagon's previously disclosed eight seriously wounded.
Cherish Adele Bean, 15, and Ethan Harry Slater, 17, were described as 'fit and well' before being discovered unresponsive at a holiday park last month.