This definition:
http://www.independent.co.uk/news/world/americas/las-vegas-shooting-nevada-terrorism-state-law-act-police-stephen-paddock-a7978456.html
Police investigating the mass shooting of concert-goers at a music festival in Las Vegas have said they are not treating the incident as an act of terrorism.
But Nevada law suggests the Sunday night massacre of at least 50 people can be defined as such.