The High Court has reserved judgment on the extradition of radical cleric Abu Hamza until a later date.
His QC says that an MRI (magnetic resonance imaging) brain scan could establish that he is unfit to plead and should not be extradited to the United States to face trial on terrorism charges.
More top news
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.