Last week, the Sony World Photography Awards announced this year's list of winners. American photographer John Moore was named as the L’Iris d’Or/ Professional Photographer of the Year, for his work in Liberia during the Ebola crisis. This year's contest attracted 173,444 entries from 171 countries. The organizers have been kind enough to share the winning images and some finalists with us, gathered below. Captions provided by the photographers.