That is ridiculous.
Domestic attacks against an illegal invader, is not and can not possibly ever be defined as a "terrorist attack".
That is like claiming Queen Boudicca was guilty of terrorist attacks in trying to get rid of the invading Romans.
It should be obvious there is nothing illegal about trying to retaliate against an illegal invader, in any possible way.
Every single bullet, missile, bomb, etc. the US has used in Afghanistan has been an illegal terrorist attack.
We are not defending a single thing in Afghanistan, but are totally the illegal aggressor.