Media Matters - Gibson knew school shooter was white because "[b]lack shooters don't" shoot themselves; "they shoot and move on"

CAN YOU CITE THAT STUDY FOR ME?
On his FOX radio show, while discussing an incident in which a student shot four people at his Cleveland high school before killing himself, John Gibson - apparently also a noted sociologist on teen rampage and racial differences - asserted that "I know the shooter was white. I knew it as soon as he shot himself. Hip-hoppers don't do that. They shoot and move on to shoot again.
(MEDIA MATTERS)