A FP article which reviews the prospects for complex urban assaults, with many links within and worthy of adding here:http://afpak.foreignpolicy.com/posts...rban_terrorism

To date there have been no repeats of Mumbai in the West and rightly the author reminds us that we are the lucky ones:
The terrorist attacks in Kabul, Mumbai, and Pakistan constitute gruesome evidence of the important role of sound command and control and intelligence in dealing with the urban adversary's potential for operational disruption in crowded cities.