A Texas law enforcement official says the 18-year-old gunman, 18-year-old Salvador Ramos, who slaughtered 21 people at an elementary school entered the building "unobstructed" through a door that was apparently unlocked. Police entered Robb Elementary within four minutes but fell back as they took fire. #texas #schoolshooting #Uvalde https://6abc.com/uvalde-texas-robb-elementary-school-active-shooter-district-lockdown/11896237/