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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Iraqi forces have begun an operation to banish Islamic State from one of their last remaining strongholds in the country.
Andrew Warren and US professor Wyndham Lathem have been charged with murdering a 26-year-old man in Chicago.
There will be a few showers in the north, but otherwise dry for many with warm sunny spells before heavier rain in the south west.