It seems like such an abstract association though. The fact that they are "sympathetic to Al'quada" does not mean that Al'quada put the bullets in the gun, and gave them some pointers on how to get the job done.
I think it is more likely that the shootings, and their stance on Al'quada are two very seperate things.
And "possibly recieved money" from Al'quada is a strange accusation. Why would Al'quada give them money, when it more than likely that people will do this sort of thing for free today anyway?