A shooting at a high school in Florida has left at least 17 people dead, but it's just one of many massacres at US schools in recent history.
The attack at Marjory Stoneman Douglas High School on Valentine's Day is the 18th school shooting to take place in America this year alone.
This means there is a shooting in a US school every 60 hours and whilst it is a shocking figure, history suggests that, sadly, it is likely to continue.
The recent shooting has once again opened the debate about gun control, but so have many before it and it seems the law is no further forward in stopping these kind of attacks.
Scroll through the gallery above to find out more about the most horrific US school shootings