On 19 December 2016, Associated Press photographer Burhan Ozbilici attended a routine job at the opening of a photography exhibition in Ankara, Turkey.
But the event descended into horror when the Russian ambassador to Turkey, Andrei Karlov, was assassinated by a local police officer later identified as Mevlut Mert Altıntas.
Ozbilici captured the murder in astonishing detail and one of his pictures won the top prize at the World Press Photo of the Year awards.
The winning image was selected from 80,408 photos submitted by 5,034 photographers from 125 countries.
Jury chair Stuart Franklin said: “I think Burhan was incredibly courageous and had extraordinary composure in being able to sort of calm himself down in the middle of the affray and take the commanding pictures that he took.”
The day after the attack last year, Ozbilici reflected on the incident in a piece for Associated Press. Scroll on to see his images and description of the assassination.
This was the winning image from Burhan Ozbilici's "An Assassination in Turkey" series. Here's how the event unfolded through his eyes...
"I decided to attend simply because it was on my way home from the Ankara office," Ozbilici told AP. "After Russian Ambassador Andrei Karlov began to make his address, I moved closer to photograph him, thinking the pictures would come in useful for stories on Turkish-Russian relations."
"He was speaking softly and — from what I could tell — lovingly about his homeland," Ozbilici added. "Then came the gunshots in quick succession, and panic in the audience. The ambassador's body lay on the floor, just meters away from me."
Ozbilici said there was panic in the audience. He captured a child being pulled to safety.
Ozbilici said: "I couldn't see any blood around him; I think he may have been shot in the back. It took me a few seconds to realise what had happened: A man had died in front of me."
Ozbilici moved to the left of the gallery, while others were "cowering on the right side" of the room. He recalled the gunman shouting "Allahu Akbar."
"He walked around the ambassador's body, smashing some of the photos hanging on the wall," Ozbilici said. The photographer advanced a little thinking: "Even if I get hit and injured, or killed, I'm a journalist. I have to do my work."
"As my mind raced, I saw that the man was agitated — and yet he was strangely in control of himself. He shouted at everyone to stand back. Security guards ordered us to vacate the hall and we left."
