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...'