The Post shot is hardly the first news photo to generate ethics concerns.

An Agence France-Presse photo that won the 2012 Pulitzer Prize generated controversy for its depiction of a girl in Afghanistan crying amid a number of bloody bodies.

Also this year, the New York Times published a graphic image showing blood streaming from the body of a victim following a fatal August shooting at the Empire State Building.

At the time, Poynter quoted a Times spokeswoman as saying the image was "a newsworthy photograph that shows the result and impact of a public act of violence."