By Brad Brooks and Gabriella Borter UVALDE, Texas (Reuters) -The gunman in the Texas school massacre barged unchallenged through an unlocked door, then killed 19 children and two teachers while holed up in their classroom for an hour before a tactical team stormed in and killed him, police said on Thursday. The latest official details from the Texas Department of Public Safety (DPS) on Tuesday’s mass shooting differed sharply from initial police accounts and raised questions about security measures at the elementary school and the response of law enforcement. The school district in Uvalde, Tex…

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