Escalon said Texas Rangers head the investigation to determine, in part, how the gunman entered the building so easily.
Once inside the classroom, which was unlocked, the attacker announced, "It's time to die."
Neighbors and parents screamed and pleaded with officers to go into the school and save the children.
Sources close to the investigation, not authorized to speak on the record, said the review of law enforcement actions is routine after a major incident, but it has intensified in this case because of differing accounts from neighbors and witnesses about what police did and when. Authorities await final collection of evidence at the scene and analysis of ballistics.
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