A convicted torturer was allowed to get within feet of Prince George in a massive security breach uncovered by The Sun.
The royal family launched an investigation after we told them driver Darren Benjamin, 40, was allowed into Kensington Palace.
Worried Prince William has demanded to know how a convicted torturer got within feet of his three young children.
"Darren is a violent criminal who was jailed for the most brutal type of torture."
Wills and Kate are said to be “concerned” he got so close.
He even told them how “pleasant” the future king was.
The violent criminal was jailed for seven years in 2008 for his part in a torture plot where an innocent man had boiling water poured down his back.
But he was allowed to deliver furniture to Kensington Palace on July 14 in his role as a driver for an independent company.
He said he was greeted by George, seven, Charlotte, four, and Louis, one, who were in the courtyard with their nanny Maria Teresa Borrallo.
A source said: “This is the type of potentially deadly security oversight that simply cannot be allowed to happen. Darren is a violent criminal who was jailed for the most brutal type of torture."
“His friends were shocked that he was able to get into the Palace and within touching distance of royalty given his past.”
On Sunday night a senior royal insider said the Duke and Duchess of Cambridge are “concerned” he got near their children with no extra protection provided.
They said: “The Duke has been informed and is obviously taking a close interest into what happened.
“He strongly believes criminals deserve a second chance once they have served their time, but is concerned current security policies might not be strong enough.
“It’s very important we know who is coming into the Palace.”
Staff are said to be shocked by the lack of detailed background checks by the royals’ large security operation.
Buckingham Palace immediately launched a high-level investigation after we alerted them.
A Palace aide said on Sunday night: “As soon as it was brought to our attention an urgent security review was launched to check the current systems and procedures are appropriate.
“Pending the outcome there will be a refined level of risk assessment for those entering.”
Benjamin, of Harlesden, North West London, was part of a four-strong gang in ski masks who tortured innocent Anthony Powell. They tied and gagged him after pouncing as he put the bins out at his Wolverhampton home. The men put a knife to the victim’s throat and stabbed him in the leg as they grilled him about a BMW Z4.
Wolverhampton crown court was told he “knew nothing about” the vehicle — but “despite his protests, they poured scalding water along his back”.
Recorder Peter Cooke told them: “This man was tortured in his own home. When you finished you left him tied up and as he struggled free he left a trail of blood around the house.”
It is believed Benjamin was unemployed before landing the delivery job. His is the second royal security scare in weeks.
Earlier this month we told how a man, 22, scaled the fence of Buckingham Palace at 2am while the Queen slept just feet away.
A Buckingham Palace spokeswoman said on Sunday night: “All deliveries to the royal estates operate under strict guidelines.
“This involves admittance of known consignments only, ID check on entry and escorting, at all times, of the driver and vehicle. All deliveries are completed with oversight from police officers and security staff.”
This article originally appeared on The Sun.