Protesters on Buckingham Palace roof

Activists have climbed on to a roof at Buckingham Palace in a protest over fathers' rights.

Martin Matthews, 48, and Bobby Smith, 33, used a ladder to breach security after another campaigner caused a distraction outside the palace, a spokesman for the activists said.

They scaled the roof of the Queen's Gallery, a public art gallery at Buckingham Palace, at around 3.15pm on Sunday and held a banner which read: "I am Harry's dad", according to the spokesman.

It is understood the Queen and Duke of Edinburgh are not at the palace tonight.

"Officers are currently speaking with the people concerned. The incident is ongoing," police said.