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this as officials are investigating what went wrong in this response. we have learned now that up to 19 officers stood in the hallway of robb elementary school for more than 457 exdrushating minutes as the gunman killed children inside of those two classrooms. the justice department has announced it is launching its own revancouver all of this response at the request of the mayor. they will provide an independent account of law enforcement actions and responses that day and look into why it took so long to take that gunman down. president biden vowing once again to do something about...

>> we have a child on the line. he is in a room full of victims at this moment. >> cnn has not been able to independently confirm that video, but source of this video sun clear, and it's also not clear at what point in the incident that audio is heard. cnn has reached out to authorities. but we do know that texas authorities, what they said on friday that there were at least eight 911 calls that day from at least two separate callers inside the school over a span of 50 minutes. this all comes as the justice department announces it will investigate the police response to the shooting....