Uvalde police and the school district have stopped cooperating in investigation into the shooting incident.

Law enforcement’s response to last week’s atrocity is being investigated by Texas officials.

Multiple law enforcement sources tell ABC News that the Uvalde Police Department and the Uvalde Independent School District police force are no longer cooperating with the Texas Department of Public Safety’s investigation into the Robb Elementary School massacre and the state’s review of the law enforcement response.

Requests for response from ABC News were not immediately returned by the Uvalde police chief or a representative for the Uvalde Independent School District.

According to sources, the decision to stop cooperating came immediately after DPS Director Col. Steven McCraw addressed a news conference on Friday, saying the delayed police entry into the classroom was “the incorrect judgment” and against policy.

A representative for the Texas Department of Public Safety told ABC News, “Investigators have been working with the Uvalde Police Department and Uvalde CISD Police. The chief of the Uvalde CISD Police Department gave an initial interview, but has yet to reply to a request from the Texas Rangers for a follow-up interview, which was made two days ago.”

Last Tuesday’s shooting, which was one of the bloodiest in US history, killed 19 children and two adults.