queen elizabeth celebrates 70 years on the throne. we re live with a preview of the upcoming celebrations. live from cnn center, this is cnn newsroom, with kim brunhuber. the mass shooting at an elementary school in uvalde, texas was an unthinkable tragedy. 19 young students and two teachers gunned down. but now we re hearing more chilling details about police failures on that day. the incident commander, police chief arredondo did not have a police radio on him at the time. we re also getting new information about a desperate 911 call by a 10-year-old student while the shooter stalked the building. reporter: new questions raised in the investigation of the deadly school shooting in uvalde. school district police chief arredondo didn t have a radio with him at the scene, something that may have hindered his ability to communicate directly with police dispatcher. i am told that this person did not have radio communication, and i don t know as to why. reporter: gut