Chaos and a "lack of urgency" plagued the police response to the deadly 2022 mass shooting in Uvalde, Texas, the US justice department has found.
Teachers and students "were trapped in a room with an active shooter for over an hour", US Attorney General Merrick Garland said.
"That should not have happened."
His comments followed Thursday’s release of a long-awaited report into one of the deadliest school shootings in US history.
The sharply critical report, spanning more than 600 pages, described how police officers remained in a hallway or outside the school as the gunman shot dozens of people in two classrooms, killing 19 children and two teachers.
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