by Chandan Khanna, with Michael Mathes in Washington Agence France Presse A gunman killed at least four people Wednesday at a hospital building in Tulsa, Oklahoma, police said — the latest mass shooting to convulse the United States as Texas families bury their dead after a school massacre nearly 10 days earlier. The suspect, who was armed with a rifle and a handgun during his attack on the Saint Francis hospital campus, died by suicide, […]