The devastating Texas shooting this week is now one of the deadliest in US history as experts begin to analyse what happened.
The horrifying incident shocked the world as it fell into the top three school shootings with the highest death toll - all of which have taken place in the last decade.
Salvador Ramos killed at least 19 children and two adults on Tuesday, May 24 when he attacked Robb Elementary School in Ulvade, Texas.
