22 of the top World Press Photos of 2017

Warning: Graphic images

"Black Days Of Ukraine" shows civilians escaping from a fire at a house destroyed by an air attack in the Luhanskaya village. Source: Valery Melnikov for Rossia Segodnya, World Press Photo via AP

The World Press Photo foundation has announced its winning images for 2017 in Amsterdam, Netherlands. 

From the battle for Mosul in Iraq to the Mediterranean migrant crisis, many winning images capture dramatic scenes on the frontlines of global news stories.

Winners in the nature category illustrate humanity's impact on animals, while winners in the sports category capture stunning triumphs and failures.

But it was the winner of the World Press Photo of the Year which has proved most controversial.

The photo shows off-duty police officer Mevlüt Mert Altıntaş, taken moments after he assassinated Russia’s Ambassador to Turkey at a gallery in the Turkish capital of Ankara.

Ambassador Andrei Karlov can be seen lying on the floor in the background, shot in the back.