Article Photos: KU professor on leave after tweet directed at NRA 1/1

This photo provided by the University of Kansas shows professor David Guth , who has been placed on leave because of a tweet he published after this week's mass shooting in Washington, the university said Friday, Sept. 20, 2013.  Guth tweeted "blood is on the hands of the #NRA. Next time, let it be YOUR sons and daughters." The NRA said it was hate speech, calling it disgusting and deplorable. The Kansas chancellor says the action was taken to prevent disruptions in the learning environment. (AP Photo/University of Kansas, Chuck France)