From a Washington Post column by Greg Sargent headlined “A new type of reporter emerges: The ‘mass shooting correspondent'”

Just as 20th-century global conflicts and new forms of mass communication created new types of on-the-scene war reportage, rising mass firearm murders in the 21st century and the immediacy of the internet have given rise to another journalistic genre. It, too, requires reporters to navigate scenes of violence and chaos, interview victims suffering from deep terror and trauma, and effectively document what they’ve witnessed in all its agony and horror.

You might call practitioners of this new genre “mass shooting correspondents.”