“The FBI has said his motives for the shooting were unclear....”
Here, let me clear it up for you. He was a Muslim. You need look no further.
Sounds like the gubbymint is trying to cover-up for Islam and the perp who they recruited via the Internet to do the killing of those they hate (military). The gubbymint be very busy trying to find recruits on the Internet for their kill missions. How many mass killings do we have per month under Hussein now? CO-INKY-DINKY?