Big omission in media coverage of 19 injured in New Orleans Mother's Day Parade Shooting

I have been looking at the media coverage of the shooting on Fox News, USA Today, New York Daily News, and others ignore a crucial part of the story: the shooting was likely gang warfare, most likely drug gang warfare.  As the Associated Press notes: "Police say gang turf wars often are the root cause." The surprise is that these other stories often relied on the AP report, but still left out this important fact.