you watching here in the united states, canada, and all around the world. i m kim brunhuber. this is cnn newsroom. and we begin in uvalde, texas. the mass shooting in an elementary school there was an unthinkable tragedy. 19 young students and two teachers gunned down. and we re now hearing more chilling details about police failures on that terrible day, details on 911 calls made from inside the classroom while the attack was under way. and cnn is speaking with the attorney for a teacher s aide from robb elementary, and she is sharing her side of the store after police falsely blamed her for leaving the door propped open. reporter: it was supposed to be an end of the year class party before it became a nightmare. she saw everything from the time he recwrecked to the time was taken out of there. reporter: she was meet agco worker with food for the party when she saw a car crash. so she propped the door open, went back inside to get her phone and called 911 to report t