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The Justice Department will review the response by local police to last week’s mass shooting at Robb Elementary in Uvalde, Texas, according to reports over the weekend. The move comes amid mounting questions over the decision to not fully engage the attacker at the scene, allowing him to remain barricaded inside a pair of classrooms for more than an hour. See a timeline here.

Local officials have faced intense criticism over contradictory details and a lack of clarity surrounding the timeline of the day. Sources say officers were present outside the classrooms by 11:35 am; however, the suspect was not killed until 12:50 pm when a tactical Border Patrol unit breached the first room. During the intervening 75 minutes, reports suggest officers were told not to engage despite multiple calls by students to 911 from inside the classrooms during that time.

Local police have also faced scrutiny following videos posted to social media showing frantic parents being restrained outside the school. 

Nineteen students and two teachers were killed in the attack. The husband of one of the adult victims suffered a heart attack and died Thursday.

Separately, investigators have not yet uncovered a motive for the shooting but say the gunman left a number of potential warning signs online.