Texas police who responded to Tuesday's mass shooting at a Uvalde, Texas, elementary school wouldn't let a tactical squad of federal agents immediately go into the school to stop the gunman, two officials briefed on the situation told New York Times.

The officials told the Times that the Border Patrol and Immigration and Customs Enforcement tactical team was forced to wait nearly an hour before they went in and shot and killed the gunman, who massacred 19 children and two adults at Robb Elementary School.

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