Shooting took place on base early Friday morning, sparking a lockdown
Sources identified the suspected gunman as Saudi Air Force aviation student Mohammed Saeed Alshamrani
Alshamrani penned a hate-fueled manifesto on Twitter just hours before the attack, according to an intelligence group who tracked down his account
The manifesto condemned the United States as a 'nation of evil' who 'support, fund and commit crimes against Muslims'
The Twitter account - now suspended - is said to also feature anti-Israel posts and a quote from al-Qaeda leader Osama bin Laden
On Friday evening, six other Saudi nationals were detained for questioning
It's reported that three of them filmed the shooting as it happened
Rep Matt Gaetz, a Republican representing Pensacola, called the shooting 'an act of terrorism'
President Trump tweeted that King Salman told him 'the Saudi people are greatly angered by the barbaric actions of the shooter...'