An armed man was arrested 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.

Armed man arrested outside Buckingham Palace

Interestingly, Queen's birthday is celebrated twice in Britain

Buckingham Palace gears up for Queen Elizabeth's 92nd birthday

The queen has been the head of Commonwealth since 1952

Succession debate? Britain's Queen Elizabeth II backs son Charles to take on Commonwealth role

The scene, filmed last summer for a documentary due to be broadcast in Britain next week, offers an unusually informal glimpse of the 91-year-old monarch, who has given very little away of her inner self during her 66-year reign

Queen Elizabeth takes dig at Trump, Obama in Attenborough's TV show

Philip, whose title is the Duke of Edinburgh, retired from public life last August although he said he would still attend some events

Britain's Prince Philip, 96, admitted to hospital: Official

The Queen is looking for a Communications Assistant at Buckingham Palace on a 12 month fixed term contract

There is a job vacancy at the Buckingham Palace as Queen Elizabeth is hiring!

The portrait, taken earlier this month, showed the queen wearing the same dress which she chose for a service of thanksgiving to mark their diamond wedding anniversary held at the Abbey where they were married

Britain releases official photo of the Queen to mark 70th wedding Anniversary

The man assaulted two police officers outside Buckingham Palace with a knife

Police arrest Buckingham Palace knife attacker

People have signed an online petition calling for the Queen to pay nearly 370 million Pounds, instead of resorting to taxpayer funds

UK public want Queen to pay for own palace repairs

The most critical work will begin in April 2017 and the palace will remain occupied and fully operational while the renovation is carried out