hello and welcome to our viewers in the united states and around the world. live from cnn world headquarters in atlanta, i m john vause, and this is cnn newsroom. texas officials are facing a growing number of questions as well as increasing criticism of law enforcement s response to the mass shooting at robb elementary. for two days now, the official count has been inconsistent, contradictory, and outright confusing at times with some major changes to some important details. did police exchange gunfire with the shooter as he entered the school? on tuesday and wednesday, the answer was yes. by thursday, no. the shooter was never confronted by a school resource officer or anyone for that matter. it just never happened. authorities say it took up to an hour before the gunman was killed, and during that time, police were calling for backup and evacuating students and teachers from other parts of the school, negotiating with the suspect himself, pinning him down in a classroo