As the details emerge about the Uvalde massacre of children, a puzzling situation appears.

According to CNN, nearly 100 law officers converged on the Robb Elementary School.

More than 100 federal officers responded to Tuesday’s deadly school shooting in Uvalde, Texas, according to Customs and Border Patrol.

“When it was all said and done, we had over 80 officers immediately on the scene, and then right after that, 150 or so officers converged on this area,” Customs and Border Patrol chief Raul Ortiz told CNN on Wednesday.

Ortiz said those officers came from several divisions, including the Border Patrol, Air and Marine Operations and Homeland Security Investigations.

But then, says CNN:

The Robb Elementary School shooter was on the premises for up to an hour before law enforcement forcibly entered a classroom and killed him, officials said Wednesday.

“It’s going to be within, like 40 minutes or something, [within] an hour,” Texas Department of Public Safety director Steven McCraw told CNN’s Ed Lavandera at a news conference.

Rep. Tony Gonzales, whose district includes Uvalde, told CNN’s Jake Tapper he was briefed that shooter Salvador Ramos was in a standoff with law enforcement for about a half-hour after firing on students and teachers.

“And then it stops, and he barricades himself in. That’s where there’s kind of a lull in the action,” Gonzales said. “All of it, I understand, lasted about an hour, but this is where there’s kind of a 30-minute lull. They feel as if they’ve got him barricaded in. The rest of the students in the school are now leaving.”

Department of Public Safety spokesperson Sgt. Erick Estrada declined to be more specific about the timeline in a CNN interview Wednesday night.

Why did this large contingent of law officers wait for 30-60 minutes before breaking into the classroom?

There were scores of “good men with guns” and one “bad man with an AR15 and a handgun.” They didn’t stop him. Why?

We will learn more in the days to come. I hope we learn why armed officers stood back and waited while 19 children and two teachers were murdered.