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Of the 679 surviving activists, who were brought to the Israeli port of Ashdod, only 50 agreed to be voluntarily deported and more than 30 are being treated in hospital for their injuries, reports the BBC's Wyre Davies in Jerusalem.
That means that almost 600 people, from several countries, are still being held in detention centres across Israel and being questioned by the authorities.
Israel has imposed an information blackout, making it difficult to gather first-hand accounts from the campaigners.