Texas police: Teacher closed propped-open door before attack at Uvalde, Texas elementary school
Investigators have now determined that the teacher, who has not been identified, removed the rock and closed the door, which did not lock.
More: https://www.khou.com/article/news/special-reports/uvalde-school-shooting/uvalde-school-shooting-teacher-closed-propped-open-door/285-37df6cd6-95ec-466c-8653-63ba5c267ae1