In a violent scene that played out in front of reporters Monday, gunfire erupted at a photo exhibition, where Russia’s ambassador was one of the speakers, killing the diplomat and wounding others. One gunman was killed, Russian officials said.

News photographers at the event captured the assassination as it unfolded:

At left, the gunman believed to have assassinated Russian Ambassador Andrei Karlov stood behind the diplomat during the opening minutes of his speech. Burhan Ozbilici/Associated Press/Associated Press