Tareq Abu Khdeir, speaking via a representative from the US consulate in Jerusalem who was allowed to visit him in the police station, sent a message to his parents: "I am holding up OK."
The fifteen year old, who is an American citizen and attends high school in Florida, is alleged to have been badly beaten by Israeli security forces during violent clashes in East Jerusalem on Thursday.
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The alleged hacking follows reports of similar attacks on other Democratic organisations, amid fears of state-sponsored hacking.