Gang bangers usually target each other, irrespective who else might be around and it’s almost always sudden and unexpected.
This guy planned to murder innocents, for maximal casualties. It could be a loner-type, but the use of a car bomb suggests Jihadi.
The only thing that indicates, off-hand, a loner event is that the guy didn’t say, “Allahu Akhbar” before shooting, or at least it hasn’t been reported yet that happened.
Not surprising, the state that I am from, early this summer in the capital city, there was a lot of shootings.
The captured shooter has been identified as Mohammad Alam, an Iranian immigrant. The identity of the other shooter is still unknown, Oates states. (KUSA-TV © 2012 Multimedia Holdings Corporation)
http://www.youtube.com/watch?v=8t6mSSI3vxM