A dramatic photo of an assassin standing over the body of Russia's ambassador to Turkey has won the 2017 World Press Photo of the Year contest. Burhan Ozbilici's picture, which also won first prize in the Spot News Stories category, shows Mevlüt Mert Altıntaş, a 22-year-old off-duty police officer, immediately after he had shot Andrey Karlov at an art exhibition in Ankara on 19 December 2016. Ozbilici is a staff photographer for The Associated Press, based in Istanbul.

World Press Photo of the Year 2017
Mevlüt Mert Altıntaş shouts after shooting Andrey Karlov, the Russian ambassador to Turkey, at an art gallery in Ankara, Turkey. Burhan Ozbilici, The Associated Press

Mary F Calvert, member of the jury, said it was a very difficult decision, "But in the end we felt that the picture of the Year was an explosive image that really spoke to the hatred of our times. Every time it came on the screen you almost had to move back because it's such an explosive image and we really felt that it epitomises the definition of what the World Press Photo of the Year is and means."

Jury member João Silva added: "Right now I see the world marching towards the edge of an abyss. This is a man who has clearly reached a breaking point and his statement is to assassinate someone who he really blames, a country that he blames, for what is going on elsewhere in the region. I feel that what is happening in Europe, what is happening in America, what is happening in the Far East, Middle East, Syria, and this image to me talks of it. It is the face of hatred."

The 2017 contest drew entries from around the world: 5,034 photographers from 125 countries submitted 80,408 images. The jury gave prizes in eight categories to 45 photographers from 25 countries. IBTimes UK presents a selection of the winners – to see more, visit the World Press Photo site.

Contemporary Issues – First Prize, Singles: Jonathan Bachman, Thomson Reuters – Taking A Stand In Baton Rouge

World Press Photo of the Year 2017
Lone activist Ieshia Evans stands her ground while offering her hands for arrest as she is charged by riot police during a protest against police brutality outside the Baton Rouge Police Department in Louisiana, USA, on 9 July 2016. Evans, a 28-year-old Pennsylvania nurse and mother of one, travelled to Baton Rouge to protest against the shooting of Alton Sterling. Sterling was a 37-year-old black man and father of five, who was shot at close range by two white police officers. The shooting, captured on a multitude of cell phone videos, aggravated the unrest coursing through the United States in previous years over the use of excessive force by police, particularly against black men. Jonathan Bachman, Thomson Reuters

Contemporary Issues – Second Prize, Singles: Vadim Ghirda, The Associated Press – Migrant Crossing

World Press Photo of the Year 2017
A woman is supported by two men while crossing a river, as refugees attempt to reach Macedonia on a route that would bypass the border fence, on 14 March 2016. Hundreds of refugees walked out of an overcrowded camp on the Greek-Macedonian border on this day, shortly after the closure of Macedonia's borders, determined to head north despite the dangers of the crossing. Vadim Ghirda, The Associated Press

Contemporary Issues - Third Prize, Singles: Daniel Etter – The Libyan Migrant Trap

World Press Photo of the Year 2017
Two Nigerian refugees cry and embrace in a detention centre for refugees in Surman, Libya, on 17 August 2016. Many claim they are regularly beaten or sexually assaulted, and receive insufficient amounts of food and water at the centre. Most of these women were attempting to reach Europe by being smuggled across the Mediterranean in boats setting sail from neighbouring Sabratah. Daniel Etter

Contemporary Issues - First Prize, Stories: Amber Bracken – Standing Rock

Contemporary Issues - Second Prize, Stories: Lalo de Almeida, for Folha de São Paulo – Victims Of The Zika Virus

Contemporary Issues - Third Prize, Stories: Peter Bauza – Copacabana Palace

Daily Life - First Prize, Singles: Paula Bronstein, for Time Lightbox / Pulitzer Center For Crisis Reporting – The Silent Victims Of A Forgotten War

World Press Photo of the Year 2017
At the hospital, Najiba holds her two-year-old nephew Shabir who was injured by a bomb blast in Kabul on 29 March 2016. Paula Bronstein, for Time Lightbox / Pulitzer Center For Crisis Reporting

Daily Life - Second Prize, Singles: Tiejun Wang – Sweat Makes Champions

World Press Photo of the Year 2017
Four students of a gymnastics school in Xuzhou, China, do toe-pressure training for 30 minutes in the afternoon. Tiejun Wang

Daily Life - Third Prize, Singles: Matthieu Paley, for National Geographic Magazine – China's Wild West

World Press Photo of the Year 2017
An Uyghur woman carries money in her stockings, a common practice. Uyghur women, while Muslim, typically do not adhere to the conservative dress code that women in neighbouring countries follow. ost of the passengers are Uygur, a Chinese minority who live mostly in the west. One of the longest train journeys in the world—2,910 miles (4,683 kilometers)—runs across China from Hong Kong to Urumqi, made up of 18 wagons, traveling over 160 kilometres per hour, and taking over five hours to complete its journey. China is transformed with every mile, from verdant jungle and arid steppe to the Taklamakan desert, the second largest shifting-sand desert in the world in the Southern branch of the Silk Road, China. Matthieu Paley, for National Geographic Magazine

Daily Life - First Prize, Stories: Tomas Munita, for The New York Times – Cuba On The Edge Of Change

Daily Life - Second Prize, Stories: Elena Anosova – Out Of The Way

Daily Life - Third Prize, Stories: Francesco Comello – Isle Of Salvation

General News - First Prize, Singles: Laurent Van der Stockt, Getty Reportage for Le Monde – Offensive On Mosul

World Press Photo of the Year 2017
The Iraqi Special Operations Forces search houses of Gogjali, an eastern district of Mosul, looking for Daesh members, equipment, and evidence on 2 November 2016. Laurent Van der Stockt, Getty Reportage for Le Monde

General News - Second Prize, Singles: Santi Palacios – Left Alone

World Press Photo of the Year 2017
An 11-year-old girl from Nigeria (left), who said her mother died in Libya, cries next to her 10-year-old brother aboard an NGO rescue boat, on 28 July 2016. The children had sailed for hours in an overcrowded rubber boat with other refugees during a rescue operation on the Mediterranean Sea, about 23 kilometres north of Sabratha, Libya. Libyan smugglers often take advantage of refugees, charging anywhere from $750 to $3500 for a place on typically dangerous boats they say are heading to Italy. Santi Palacios

General News - Third Prize, Singles: Noel Celis, Agence France-Presse – Life Inside The Philippines' Most Overcrowded Jail

World Press Photo of the Year 2017
A scene in Quezon City Jail, one of the Philippines' most overcrowded prisons. Conditions are getting worse as police wage an unprecedented war on crime. There are 3,800 inmates at the jail, which was built six decades ago to house 800, and they engage in a relentless contest for space. Men take turns to sleep on the cracked cement floor of an open-air basketball court, the steps of staircases, underneath beds and hammocks made out of old blankets. Noel Celis, Agence France-Presse

General News - First Prize, Stories: Daniel Berehulak, for The New York Times – They Are Slaughtering Us Like Animals

General News - Second Prize, Stories: Sergey Ponomarev, for The New York Times – Iraq's Battle To Reclaim Its Cities

General News - Third Prize, Stories: Alessio Romenzi – We Are Not Taking Any Prisoners

Nature - First Prize, Singles: Francis Pérez – Caretta Caretta Trapped

World Press Photo of the Year 2017
A sea turtle entangled in a fishing net swims off the coast of Tenerife, Canary Islands, Spain, on 8 June 2016. Sea turtles are considered a vulnerable species by the International Union for Conservation of Nature. Unattended fishing gear is responsible for many sea turtle deaths. Francis Pérez

Nature - Second Prize, Singles: Nayan Khanolkar – Big Cat In My Backyard!

World Press Photo of the Year 2017
A wild leopard strolls through Sanjay Gandhi National Park, a protected area in the northern part of Mumbai city, India, on 24 September 2016. The leopard is on its nocturnal prowl in the adjacent human settlements in search of food, which in these areas is typically dogs or pigs. Nayan Khanolkar

Nature - Third Prize, Singles: Jaime Rojo – Monarchs In The Snow

World Press Photo of the Year 2017
A carpet of monarch butterflies covers the forest floor of El Rosario Butterfly Sanctuary, in Michoacán, Mexico, on 12 March, after a strong snow storm hit from 8 to 9 March, 2016. The storm hit the mountains of Central Mexico, creating havoc in the wintering colonies of monarch butterflies just as they were starting their migration back north to the USA and Canada. Jaime Rojo

Nature - First Prize, Stories: Brent Stirton, Getty Images for National Geographic Magazine – Rhino Wars

Nature - Second Prize, Stories: Ami Vitale, for National Geographic Magazine – Pandas Gone Wild

Nature - Third Prize, Stories: Bence Máté – Now You See Me

People - First Prize, Singles: Magnus Wennman, Aftonbladet – What Isis Left Behind

World Press Photo of the Year 2017
Five-year-old Maha and her family fled from the village Hawija outside Mosul, Iraq. The fear of so-called Islamic State and the lack of food forced them to leave their home, her mother said. Here, Maha lies on a dirty mattress in the overcrowded transit centre in Debaga refugee camp. “I do not dream and I'm not afraid of anything anymore,” Maha said quietly while her mother's hand stroked her hair. Magnus Wennman, Aftonbladet

People - Second Prize, Singles: Robin Hammond, NOOR Images for Witness Change – Mental health problems in disabling environments in Africa

World Press Photo of the Year 2017
Hellen (41) lives with a mental health problem. Her illness developed later in life. In developing countries, over 80 percent of people living with mental health problems do not receive any treatment. In African countries, treatment often comes in the form of prayer from a pastor or traditional healer. Modern medicine is available to very few. A mental health problem often means relegation to the margins of society; life in mental health facilities often doing more harm than good, and coming attached with crippling social stigma. Cultural beliefs and associations that link mental disorders to witchcraft are deeply rooted in some communities. Robin Hammond, NOOR Images for Witness Change

People - Third Prize, Singles: Kristina Kormilitsyna, Kommersant Newspaper – Fidelity

World Press Photo of the Year 2017
A woman strokes a girl’s head as she rests on her lap whilst sitting on a sofa in a police station in Camaguey, Cuba, on 12 February 2016, with a portrait of Fidel Castro hanging above them. Kristina Kormilitsyna, Kommersant Newspaper

People - First Prize, Stories: Michael Vince Kim – Aenikkaeng

People - Second Prize, Stories: Antonio Gibotta, Agenzia Controluce – Enfarinat

People - Third Prize, Stories: Jay Clendenin, Los Angeles Times – Olympians

Sports - First Prize, Singles: Tom Jenkins, The Guardian – Grand National Steeplechase

World Press Photo of the Year 2017
Jockey Nina Carberry flies off her horse, Sir Des Champs, as they fall at The Chair fence during the Grand National steeplechase, during day three of the Grand National Meeting at Aintree Racecourse on 9 April 2016 in Liverpool. Tom Jenkins, The Guardian

Sports - Second Prize, Singles: Cameron Spencer, Getty Images – The Dive

World Press Photo of the Year 2017
Gaël Monfils of France dives for a forehand in his fourth round match against Andrey Kuznetsov of Russia, during the 2016 Australian Open at Melbourne Park, Australia, on 25 January 2016. Cameron Spencer, Getty Images

Sports - Third Prize, Singles: Kai Oliver Pfaffenbach, Thomson Reuters – Rio's Golden Smile

World Press Photo of the Year 2017
Usain Bolt of Jamaica smiles as he looks back at his competition, whilst winning the 100-metre semi-final sprint, at the 2016 Olympics in Rio de Janeiro, Brazil. Bolt is regarded as the fastest human ever timed. He is the first person to hold both the 100-metre and 200-metre world records since fully automatic time became mandatory. Kai Oliver Pfaffenbach, Thomson Reuters

Sports - First Prize, Stories: Giovanni Capriotti – Boys Will be Boys

Sports - Second Prize, Stories: Michael Hanke – Youth Chess Tournaments

Sports - Third Prize, Stories: Darren Calabrese – Adaptive Athlete

Spot News - First Prize, Singles: Jamal Taraqai, European Pressphoto Agency – Pakistan Bomb Blast

World Press Photo of the Year 2017
Lawyers help their injured colleagues after a bomb explosion in Quetta, Pakistan, on 8 August 2016. Seventy people were killed when a bomb exploded outside a civil hospital where a crowd of lawyers and journalists had gathered to mourn Bilal Anwar Kasi, a senior lawyer who had been assassinated hours earlier. Jamal Taraqai, European Pressphoto Agency

Spot News - Second Prize, Singles: Abd Doumany, Agence France-Presse – Medics Assist a Wounded Girl

World Press Photo of the Year 2017
A Syrian girl cries out as a wounded child lies next to her at a makeshift hospital on 12 September 2016. She had been injured in reported government airstrikes on the rebel-held town of Douma, east of Damascus, Syria. Abd Doumany, Agence France-Presse

Spot News - Third Prize, Singles: Felipe Dana, The Associated Press – Battle For Mosul

World Press Photo of the Year 2017
A car bomb explodes next to Iraqi special forces armoured vehicles as they advance towards Islamic State-held territory in Mosul, Iraq, on 16 November 2016 Felipe Dana, The Associated Press

Spot News - First Prize, Stories: Burhan Ozbilici, The Associated Press – An Assassination in Turkey

Spot News - Second Prize, Stories: Ameer Alhalbi, Agence France-Presse – Rescued From the Rubble

Spot News - Third Prize, Stories: Mathieu Willcocks – Mediterranean Migration

The prize-winning photographs can be seen in an exhibition that opens in De Nieuwe Kerk, Amsterdam, on 14 April 2017, and then travels to 45 countries.