Bradley Manning was pictured earlier arriving at Fort Meade in the US state of Maryland, where he will face a military judge.
His sentencing is expected in the next few minutes.
More top news
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."