My theory is that it is like the same thing.
There is no thunder without lightening.
To separate the terror attack from the terror drill is just impossible, probably even unthinkable.
It would be like separating terrorism from what govern-cement does. The text book definition of terrorism is the Infernal Revolting Syndicate.
So, that's my theory ^_^
LOL, they do seem inseparable like new lovers :P