weeks of horror. three mass shootings. the latest hours ago in tulsa, oklahoma. police say a gunman burst into a medical building on a hospital campus and killed four people including the doctor he blamed for his post surgical pain. we also learned from police that that killer bought an assault-style rifle less than three hours before the attack and a handgun only three days earlier. we are also letting new details about last week s horrific school attack in uvalde, texas. the mayor says a negotiator tried and failed to reach the killer as he was barricaded in a fourth grade class room. today two of his 21 victims will be buried. and next hour, in buffalo, new york, the teenager accused of killing ten people in a racist attack at a grocery store will be in court. he faces more than two dozen charges including counts that are terror, and hate crime related. 223 mass shootings, already this year. more mass shootings than days so far. and cnn is on top of all these development