A woman has been arrested after breaking into the school attended by Prince George, Scotland Yard has said.
The 40-year-old woman was held on suspicion of attempted burglary.
A review has been launched of security arrangements at Thomas’ Battersea school, London.
Prince George, only began his primary school education last week. The event was widely publicised in Britain and beyond.
London’s Metropolitan Police said a 40-year-old woman was arrested on Wednesday and was now in police custody.
The woman is suspected of having gained access to the school, but police gave no details about exactly what had happened.
“We are working with the school, which is attended by His Royal Highness Prince George, to review its security arrangements after the incident,” police said in a statement.
A spokeswoman for Kensington Palace, the residence of Prince William and his family said, “We are aware of this issue but won’t comment on security matters.”