//A Saudi pilot who killed three people on a US airbase in Florida had called America a "nation of evil" and quoted Osama bin Laden in social media posts hours before opening fire, according to an extremism monitoring group.
The killer, a member of the Royal Saudi Air Force who had been training at the Pensacola airbase, was shot dead by a sheriff's deputy.
He has not been formally identified, although Reuters quoted two unnamed officials as saying he was Second Lieutenant Mohammed Saeed Alshamrani.
The SITE Intelligence Group, which tracks Islamist extremism online, said that he had posted on Twitter about US wars in the Middle East shortly before the shootings.
Police have said they are investigating whether the attack was terror-related...//
https://www.independent.co.uk/news/world/americas/saudi-pilot-florida-airbase-mass-shooting-osama-bin-laden-pensacola-mohammed-saeed-alshamrani-a9237406.html
What's to investigate?