In part four of this five-part series, we watch as people realize just how flawed the police response at Robb Elementary really was.

Videos:

• Frontline: Inside the Uvalde Response

• Frontline: After Uvalde: Guns, Grief, and Texas Politics

• Cell phone video of the parents imploring the police to do something

• Disturbing new footage shows Salvador Ramos in Uvalde school, cops running | New York Post

• Ballistic Gel Human Head VS 223

• Video: Greg Abbott and Beto O’Rourke clash over Uvalde deaths as governor provides more details on school shooting

Articles and books:

• Before the school shooting, Uvalde was known for a 1970 Hispanic student walkout. Its aging participants fear its spirit and memory are fading.

• Timeline of the events leading up to, including, and following the attack on Robb Elementary

• Department of Justice: Critical Incident Review

• Uvalde buries 10-year-old Amerie Jo Garza, the first of many funerals to come

• Texas cops’ claims unravel: Police didn’t "engage" Uvalde shooter — but they cuffed scared parents

• Gunman bought two rifles, hundreds of rounds in days before massacre

• Uvalde: 90 minutes of terror, a failed police response and shattered trust

• Mom who saved her kids from Uvalde school shooting says police are targeting her

• NRA holds convention in Houston days after Texas school shooting

• Before massacre, Uvalde gunman frequently threatened teen girls online

• The Pulitzer Prize: The Washington Post's winning 2023 series on the damage caused by AR-15s

• Nearly two years after the Uvalde massacre, here’s who has been reprimanded and where investigations stand

• Uvalde school shooter’s self-proclaimed ex accused of making threats against the community

• Uvalde victim's uncle elected to school board nearly two years after shooting

• Uvalde mayor abruptly resigns ahead of a council vote on shooting report

• 21 lives lost: Uvalde victims were a cross-section of a small, mostly Latino town in South Texas

• Teenage cousin of Uvalde school shooter arrested and accused of threatening to do 'the same thing'

• Uvalde schools hire — and then fire — former DPS trooper under investigation for shooting response

• The Gunman in Uvalde Left Multiple Hints Before His Attack Began