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