(CNN)As a broken community tries to make sense of a massacre that took the lives of 19 young children and two teachers, authorities have offered shifting timelines of what happened inside the Uvalde, Texas, school.

On Friday, Texas Department of Public Safety Director Steven McCraw laid out the most detailed breakdown the public has received to date about the horror that unfolded in Robb Elementary School on May 24 -- and attempted to offer some answers about the way authorities responded.

Among the details we know now are: that a school officer drove right past the shooter -- 18-year-old Salvador Ramos -- while Ramos fired at the school; that as many as 19 officers were inside the school more than 45 minutes before the suspect was killed; that the school district police chief decided not to breach the classroom where the shooter was; and that a young girl from the class called 911 several times asking for police while authorities were right outside.

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CNN created a timeline of events with information provided by McCraw, social media posts and other reporting that offers a look into what came before the shooting and a minute-by-minute breakdown into the attack -- and how authorities responded to it.

Steven McCraw, director of the Texas Department of Public Safety, speaks during a press conference on May 27, 2022.

In the months prior

In September 2021, the shooter asked his sister to help him buy a gun and she "flatly refused," McCraw said.

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