Support WBURThe story about how the Uvalde gunman entered the school is shiftingBill ChappellLaura BenshoffJune 01, 2022 ShareBalloons and caution tape are seen at the entrance to Robb Elementary School in Uvalde, Texas, on Tuesday. Investigators had initially said a teacher left a back door propped open at the school, but that account has now shifted. (Getty Images)