Seven weeks after the killing spree at an elementary school in Uvalde (Texas) that killed 21, new videos of the crime have become public.

The recordings published on Tuesday by the local newspaper "Austin American-Statesman" and the broadcaster KVUE show, among other things, that several armed police officers stayed in the school hallway for more than an hour before they shot the 18-year-old offender in a classroom.

At the beginning of the recording, an emergency call from a teacher who saw the perpetrator in the parking lot can be heard.

"Go into the classroom," she calls out desperately to the students.

When the gunman enters the school, it is 11:33 a.m. according to the camera.

Sofia Dreisbach

North American political correspondent based in Washington.

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The recordings can be heard firing dozens of shots in the first minute and a half;

According to investigators, there were more than 100 in total. When several police officers - nine can be seen on the video - entered the building three minutes after the perpetrator, shots were still being fired.

However, it took an hour and 14 minutes for the now much more numerous and heavily armed officers to intervene and finally shoot the perpetrator.

In between you can see how an official disinfects his hands on a dispenser in the hallway.

"You don't have to go through this again"

The security forces have been heavily criticized for weeks for their actions in the killing spree.

The head of the Texas security agency, Steven McCraw, had accused them of "miserable failure".

On Tuesday, however, McCraw condemned the 77-minute video footage that was released before the victims' families saw it.

He was "deeply disappointed".

They "should have been among the first to see it."

Uvalde Mayor Don McLaughlin was also critical.

The video should have been shown to the families in an edited version.

"They don't have to go through this again, they've been through enough."

Neither the shooter nor the shots should be heard on the recordings.

Relatives of the victims called on social networks not to distribute the video.

The District Attorney's Office is leading an investigation into the police operation in Uvalde.