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>> reporter: in that crucial time, survivors inside both classrooms made desperate calls to 9-1-1. >> she identified herself and whispered she is in room 112. at 12:10, she called back and room 12 guised multiple are dead. 12:13, she called again on the phone. at 12:16, she called back and said there is eight to nine students alive. >> minutes later, a student called. >> reporter: student/child called back, was told to stay on the line and be very quiet. told 911 he shot the door. approximately 12:43 and 12:47, he she asked police to come now. >> something's got to be done now. where...

entering the elementary school. and we know more than an hour passed between the first 911 call and when the shooter was killed. police now acknowledge that tragic mistakes were made. >> the decision was made that this is barricade the subject situation, there was time to retrieve the keys and wait for a tactical team with the equipment to go ahead and breach the door and take on the subject at that point. that was the decision. it was the wrong decision, period. >> the incident commander has been identified as uvalde school district police chief pedro pete arredondo. he made two bri...

this. if you look behind me, you can see the 21 crosses with the names of 19 little kids and two teachers killed in their classroom. 2 place they were supposed to be safe. what we're learning about the police response raises some disturbing questions. police vealing nobody was there the try to stop the gunman when he got in through door that was apparently locked and he was inside for about an hour before he was killed. how can that happen? what happened? an hour when desperate parents were all crowded outside. they were pleading with police to go in and let them go in or let them go...

elementary school. she saw her teacher killed. for the first time we learn what the killer said before he fired his gun in that classroom. we hear new details about what he did, this witness says he played music during the massacre. and we learn what this brave 11-year-old did to stay alive while it was all happening. all of this at the top of the next hour. in the meantime, the police response to the tragedy that took place here is facing intense scrutiny and there are new questions about the timeline. this is what we know. the 18-year-old gunman was not -- not -- confronted by la...

still chief among the questions out there and why is the police department now backtracking on some of their basic findings? officials are going to be holding a briefing in texas in the next hour. let's begin though at this hour with cnn's rosa flores live in uvalde. rosa, what are you hearing from some of these children who managed to survive? >> reporter: well, kate, we are hearing about those intense moments when the shooter was inside the classroom, those intense moments when children were trying to do everything they could to survive. they describe the gunfire at first. they tho...