IED factory inside their house.
Farooq Syed recently returned from Saudi Arabia and began growing out his beard.
His wife was the other shooter.
They dropped off their 6 month old child at granny's house before the shooting.
They wore Go Pro cameras while they did their killing.
I would venture to guess they had much more support behind the scenes than just two nutbags they decided to go on a shooting spree.
Everything they had in their possession was illegal by the State of California. I guess gun laws, no matter how strict they are, will not matter with people that want to do harm to others.