The city and school district police departments in Uvalde, Texas, have stopped cooperating with a state-led investigation into last week's deadly school shooting.

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An officer walks outside of a school.

AFP via Getty Images

The Uvalde Police Department and the Uvalde Consolidated Independent School District Police Department are cooperating with the Texas Department of Public Safety.

They stopped cooperating after the Friday press conference in which Steve McCraw criticized the school district police department for waiting over an hour before breaking into the classroom.

The Texas Department of Public Safety, Uvalde Police Department and Uvalde school district did not respond to requests for comment from Forbes.

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A lone shooter killed 19 children and two adults at Robb Elementary School in Uvalde, making it the deadliest U.S. school shooting in almost a decade. It took more than an hour for the police to confront the shooter after he entered the school through an unlocked door, a delay that seemed to clash with longstanding guidance for police to immediately confront active shooters. Police waited for help because they thought the shooter was a barricaded suspect and not an active shooter, a mistaken belief that drove them to wait for help.

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The federal Department of Justice is conducting its own review of the Texas shooting after Uvalde officials requested it.

The Uvalde police and school district are no longer cooperating with the Texas investigation.