. >> uvalde county 911. >> narrator: ...and hundreds of recorded interviews. >> it's my understandingt, that you were working the day of the incident? is that correct? >> yes, sir. >> narrator: these are the firsthand accounts of the officers who responded to the shooting at robb elementary. >> we'll go ahead and cut, start this interview. um... agent valdez, um, on that, do you remember that day, the 24th? ♪ ♪ 21 people killed, including 19 young students. >> the second-deadliest school shooting in u.s. history. >> narrator: in the immediate aftermath of the shooting in uvalde, officers were praised for how they'd responded. >> law enforcement officials did what they do. they showed amazing courage by running toward gunfire. >> narrator: but quickly, a different story began to emerge. >> there were growing concerns today about how police responded to the deadly elementary school massacre in uvalde, texas. he managed to sta inside for an hour... >> after the governor praised the response, and then it turned out that was almost the posite that happened, we knew that we had to figure ou