New footage of the shooting at Robb Elementary School in Uvalde, Texas, has been released to the media. The 18-year old gunman killed 19 children and two teachers with a semi-automatic rifle on May 24. It's one of the deadliest school shootings in U.S. history. Texas Governor Greg Abbott supported the release of the video on July 12, saying the public has the right to know exactly what happened. The following footage may be disturbing.