The Uvalde school district's police force hosted an "active shooter scenario training" session in March, just two months before a gunman shot and killed 19 children and two teachers this week at an elementary school in Uvalde, Texas.

The event, which was posted on the Uvalde Consolidated Independent School District Police Department's Facebook page, took place on March 21. The Facebook post titled the event "Active Shooter for School-Based Law Enforcement" and encouraged "Peace Officers, School Resource Officers, and campus security officers" to attend.

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Despite the training, 18-year-old Salvador Ramos entered Robb Elementary School on Tuesday and slaughtered a class of fourth graders as police officers remained outside and prevented parents from attempting to rescue their children as they called for backup. It took nearly an hour before Border Patrol and other tactical teams entered the building and killed the shooter.

"On Monday the UCISD Police Department hosted an ‘Active Shooter Training’ at the Uvalde High School. Our overall goal is to train every Uvalde area law enforcement officer so that we can prepare as best as possible for any situation that may arise," the Uvalde school district police force's event post read. "We have hosted several of these courses and plan to continue to do so."

The training was mandated by Texas House Bill 2195, which requires school resource officers to complete trainings on active shooter situations. The course itself was developed by the Texas Commission on Law Enforcement.

Law enforcement officials have faced considerable criticism in the wake of the shooting, and an investigation into how authorities responded to the massacre is underway.

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Steven McCraw, director of the Texas Department of Public Safety, said at a press conference Friday that the on-scene commander at Robb Elementary School "was convinced at the time [of the shooting] that there was no more threat to the children." He added that authorities had believed the situation went from an active shooter to a barricaded subject.