The Dutch royal family has said it will return a painting from its collection thought to have been looted by the Nazis during World War Two. The painting, by Joris van der Haagen, had been bought by Queen Juliana from a Dutch art dealer in 1960.

The palace said an investigation looked at tens of thousands of art works in the House of Orange's collection. Officials have contacted the heirs of the original owner, who was not named, to arrange its return.