Lucifix, go read my earlier post before talking about whether this was a crime or an act of war. In fact any amount of research will show that, as far back as the 90's, ole Bin Laden and his ilk had been preaching about how they were on Jihad against Western civilization in general, and America in particular. Next, go look up what Jihad means, hopefully after that I don't have to connect the dots any further for you.
You can look at it this way;
War is a crime, did we send the LAPD or NYPD or federal marshals over to take on Japan in WW2? Who do you think the first "police" were in the past, but the military.
Most cities used either guard units, or militia to keep the peace and enforce the laws, Why do you think so many European military units bear names like Guards or Watch? The terms come from these militias that were used to keep the peace, and served in the field as a military force when attacked.
Different crimes may require different agencies to pursue and prosecute the perpetrators. Since the scale and violence of this act far exceeded the capabilities of any police agency in the world, then we are using the proper force for the task. Actions and events in the past have proven that these people will not stop until they are dead and in their graves, or we give in to their demands.
Considering some of their demands, I say let them start digging.
Damn, there you go, making me be serious again!