A Royal Navy training base was 'locked down' following alleged claims of revenge porn, with young recruits ordered to 'hand in their phones' during an urgent investigation.

The digital blackout, known as 'River City state', was instated at HMS Raleigh, Torpoint, Cornwall, in a bid to stop a 'sex tape from going viral'.

Hundreds of novices, some as young as 16 or 17, were told to cease all online communication after intimate photographs were shared throughout the training HQ of a young female recruit by her partner, a pervious rookie who had joined in a separate intake, without her consent.

A Navy source allegedly told The Sun: 'By that point her former partner had already left the Navy. He never completed training.

'Only one person is under investigation. No other recruits are suspected of wrongdoing.'