I've been waiting for more facts before I make a call on this one.
In the meantime let's not jump to conclusions concerning Muslim fundamentalism being the motive although to me personally it does seem to be the case given the facts and circumstances thus far.
In my opinion these two had not recieved any formal guerilla training, not even the basics. If they had, their bomb making skills would have been far more advanced but they were less than amateurs at it.
It seems AK were used which had been purchased legally but not by the perps. Legal AKs are not full auto but are hands down the easiest of modern assualt rifles to convert to full auto, it can be don in minutes with a grinder or an hour with a file, you certainly don't need formal training to know how.
The facts just arent clear enough yet to make a call. Ill wait before I offer up anything more.