A jury has been sworn in at the Old Bailey for a terror trial that will be partially held in secret.
Mr Justice Nicol told the jury of eight women and four men that parts of the trial of Erol Incedal will never become public.
He is accused of engaging in conduct in preparation for acts of terrorism and possessing a document useful for terrorism, entitled “bomb making”.
The 26-year-old from London denies both allegations.
Prosecutors will formally open their case on Tuesday – although it is not clear how much of the allegations against Mr Incedal will be heard in public.
Mr Justice Nicol told the jury that they must reach verdicts according to the evidence heard in court – and they must not discuss what they hear and see with anyone outside their number.