Actually, according to the criminal complaint filed, he was planning to attack the mall on December 22 and detonate several hand grenades in the food court and surrounding area. His own statement was that his intention was "to disrupt Christmas." His intention was to purchase hand grenades through underworld connections-fortunately he ended up getting connected with a UC
Fortunately it appears that he was acting alone as an individual, not part of a larger plot. From what I gather from reading the complaint and affidavit, he realy wanted to attack the local courthouse but felt it to be too risky. He chose the mall because it's an easier target. Mall owners and managers have been concerned about the possibility of terrorist actions for several years now. From what I've heard from industry sources, they're frankly relieved that this is the only major threat to date to have happened.
Frankly I am surprised that these sorts of folks haven't though of attacking the easiest target of all-a school. Any decent terrorist could easily take most schools and kill 100+ students before the police would be able to respond. To beat the terrorists, you have to think like them.
"When a man runs on railroads over half of his lifetime he is fit for nothing else-and at times he don't know that."