The Netherlands' King Willem-Alexander has announced that Dutch royals will cease using a historic golden carriage amid a debate over slavery links. Critics say that one side of the horse-drawn carriage, called De Gouden Koets, is decorated with an image that glorifies the country's colonial past. Out of use since 2015, the carriage has traditionally been used to carry Dutch monarchs to the opening of parliament. The move comes amid an ongoing debate in the country over its history.