Authorities said the suspect, 18-year-old Salvador Ramos, allegedly shot his grandmother prior to opening fire at the school. Two teachers were among those killed at Robb Elementary School. WATCH FULL EPISODES OF WORLD NEWS TONIGHT: https://abc.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://bit.ly/3iQLwPp #WorldNewsTonight #MassShooting #Texas