Four people were killed Wednesday in a shooting at a medical building in the Midwestern U.S. state of Oklahoma, a police official said. Deputy Chief Jonathan Brooks of the Tulsa Police Department confirmed the number of dead and said the shooter also died, apparently from a self-inflicted gunshot wound. It was unclear what prompted the deadly assault. However, the unidentified gunman fired both a handgun and a rifle during the attack, Brooks said. "Officers are currently going through every room