David Friend. Watching the World Change. (6).

Friend, David. Watching the World Change: The Stories Behind 9/11. I.B. Tauris. 2006. London / New York.

In relation to my ongoing investigations on the use of images derived from TV screens, Friend quotes Vin Alabiso (executive editor of Associated Press) relating its initial extended use in print journalism to the Clinton impeachment hearings in 1999. While photographers were prohibited from the proceedings, film cameras were not: the only images available then, were from frames grabbed from the screen. (p95) 

In relation to images from 9/11, Friend quotes Albaiso as follows:

"That immediacy on 9/11 clearly illustrated a paradigm shift in photojournalism. The very first images we transmitted that morning were not from traditional film or digital stills but, in fact, were 'frame-grabs' from video - in virtual 'live time' of the attack precisely as it happened." (p94)

Friend also notes, with reference to the above, that the immediacy afforded by mobile phones with internet access ability did not become available until 2004.

Additionally:

By 2001, digital images had done away with the need for the finished print. The process now is the picture. [...] Today the eye of the photographer is hardly separated by more than a few blinks from the eye of the beholder. (p96)

And:

Quite often many observers cannot separate a news event from its visual representation. (p97)