The question on everyone's mind today: Why?

Why did an 18-year-old turn a gun on his grandmother and then kill 19 children and two teachers inside a Texas elementary school? Officials tell CNN all that death occurred in one classroom ... that the gunman entered the room, locked the door behind him, and opened fire. Other victims are in the hospital right now fighting for their lives. Our coverage of this tragic story begins in Uvalde with CNN's crime and justice reporter Shimon Prokupecz.

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