Princess Charlotte has been dragged into a chilling royal security scare after a court heard a man accused of stalking Andrew Mountbatten-Windsor allegedly searched for the 11-year-old princess online — along with weapons, explosives and “methods of killing.”

The disturbing allegations surfaced during proceedings involving Alex Jenkinson, 39, who is set to stand trial next month over claims he confronted Andrew, 66, near his home on the Sandringham estate in Norfolk on May 6.

But what began as an alleged stalking case involving Andrew has now raised terrifying questions about the safety of the royal children.

Prosecutors said police examined Jenkinson’s phone after his arrest and uncovered a string of alarming Internet searches. According to the court, those searches allegedly included Princess Charlotte, the Princess of Wales and her children, firearms, knives, explosives and ways to kill.

The claims were serious enough for Suffolk Constabulary to seek an interim stalking protection order while the criminal case continues. The order has now been granted, with a full hearing scheduled for August.

James Farrell, representing Suffolk Constabulary, told the court the alleged searches showed more than casual curiosity.

“We say this shows a pattern of behaviour and targeted escalating behaviour associated with stalking,” Farrell said.

He added that Jenkinson allegedly displayed “elements of grievance and fixation” and warned that existing bail conditions were not enough to control the alleged risk.

“We have reasonable cause to believe the order is necessary to protect the complainant from risk,” Farrell said. “We say the bail conditions are not sufficient to mitigate the escalating risk.”

Then came one of the most chilling warnings of the hearing.

Farrell said that without strict monitoring, Jenkinson “could get fixated on more weapons and methods of killing and that could spiral out of control with more serious consequences.”

A source familiar with the proceedings said the alleged mention of royal children sent alarm bells ringing far beyond Andrew’s security team.

“The concern was that this was not staying focused on one person,” the insider said. “Investigators believed the behavior appeared to be broadening, and once children were mentioned, that changed the level of concern dramatically.”

The source added that the allegations have fueled a major security rethink around the youngest royals.

“The fact children have been mentioned in this case has led to a massive increase in security around the royal children, including the most vulnerable ones such as Charlotte,” the insider claimed.

Jenkinson has pleaded not guilty to allegations that he used threatening, abusive or insulting words or behavior to harass or cause alarm or distress.

The charges stem from an alleged incident near Marsh Farm, close to the Sandringham estate, where Jenkinson is accused of approaching Andrew before chasing him on foot and by car.

The court heard Jenkinson was allegedly wearing a balaclava and camouflage clothing at the time.

Armed officers later detained him. According to the hearing, he was allegedly carrying a wooden-handled axe and had a rock in his pocket.

Jenkinson was initially held under the Mental Health Act and was later discharged after reportedly trying to leave the hospital.

He remains under strict bail conditions. He is banned from contacting Andrew or entering Norfolk.

He is also barred from coming within 500 meters of several royal residences, including Sandringham, Buckingham Palace, Balmoral Castle, Windsor Castle and Highgrove.

Benjamin Thiele-Long, representing Jenkinson, argued that another order was unnecessary because his client had not been accused of any further offenses since his arrest and was already under tough bail restrictions.

But Deputy Senior District Judge Tan Ikram sided with authorities and granted the interim stalking protection order.

The order places tight controls on Jenkinson’s movements and Internet use while the case moves toward trial.

A second source familiar with the case said officials were not willing to take chances.

“None of the allegations have been proven, but the authorities argued the potential risk justified additional safeguards,” the source said. “The court clearly accepted that more protection was needed while the case is tested.”

The allegations have now thrown a harsh spotlight on the hidden dangers facing the royal family’s youngest members.

Princess Charlotte, the daughter of Prince William and Princess Kate, is only 11 years old. But as one of the most recognizable children in the world, she already lives under a level of protection most adults could never imagine.

Now, after claims that her name surfaced in a case involving alleged stalking, weapons searches and killing methods, royal watchers are being reminded just how dark life behind the palace gates can get.