Police intervention

New videos recorded during Texas shooting show parents urging police to intervene sooner

The videos emerging - along with initial accounts of the shooting timeline from authorities - suggest up to an hour passed between the time the attack began and the moment specially trained officers breached the fourth-grade classroom where 18-year-old Salvador Ramos had killed 19 children and two teachers, shooting him dead.

The New York Times reported that most, if not all, of the victims of the worst school shooting in nearly a decade likely died in the first few minutes of the attack, citing a person familiar with a preliminary timeline compiled by investigators.