A woman was arrested after she tried to break into Prince George's school yesterday afternoon.
A review of the security measures and procedures at Thomas's Battersea school was carried out last night after an unnamed woman was detained at the gates of the children's learning facility at around 2:15pm on suspicion of attempted burglary.
The suspect allegedly gained unlawful access to the school on Tuesday afternoon before leaving unchallenged after she posed as a visitor.
But she raised eyebrows when she returned the next day (Wednesday) at around the same time and was spotted loitering around outside the gates.
A Scotland Yard spokesman said: "The arrest at 14:15hrs on Wednesday, 13 September relates to an incident at Thomas's Battersea school on Tuesday, 12 September when an individual gained access to its premises.
"The arrested woman was taken to a south London police station where she remains in custody. We are working with the school, which is attended by His Royal Highness Prince George, to review its security arrangements after the incident. Police were alerted and officers attended immediately after the issue came to light."
It is understood that the woman did not have contact with any of the children at the school and, although motives are currently unclear, no one was said to be in danger.
Four-year-old George - the eldest child of the Duke and Duchess of Cambridge - started at the school, which costs £18,000 a year, last week but was not present at the time of the incident as he finishes at 12pm due to reception only attending mornings.