An armed man was arrested on Sunday at the entrance of Buckingham Palace, London police said, ruling out the possibility it was terror-related. Police said the 38-year-old was carrying a Taser stun gun, adding that he remains in custody.

"It's not terrorism-related. It's just a single standalone incident," a police spokeswoman told AFP. She provided no other details. Members of the royal family are currently on their summer break, with Queen Elizabeth II and Prince Philip staying at Balmoral Castle in Scotland.