Defence Secretary has demanded an investigation at Sandhurst military academy after an undercover journalist walked around the grounds carrying a fake bomb.
The Sun said Prince Harry was at the college while its investigator spent seven hours wandering the grounds and corridors unchallenged.
The reporter took video footage of the prince, a cadet at the academy, and claims he gained access to soldiers' quarters. An MoD spokesman said: "We treat any kind of breach of security extremely seriously.
"Sandhurst is now conducting a review of its procedures and we will be implementing any changes we feel are necessary."
Defence Secretary John Reid said: "I have demanded an immediate investigation into this serious security breach.
"I have instructed Sandhurst to change their procedures to prevent a recurrence."
In April, the paper claimed to have driven a fake bomb into the grounds of Windsor Castle.
It happened just before the wedding of Prince Charles to Camilla Parker Bowles.
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