Nasrallah - Why Doesn't the FBI Want Him?

Hezbollah is designated a terrorist organization by the United States. The FBI is keeping tabs on and watching out for Hezbollah cells in the U.S. The Washington Post (credit for photo) reported in 2004 that

Al Qaeda, the (9/11) commission determined, may even have played a "yet unknown role" in aiding Hezbollah militants in the 1996 bombing of the Khobar Towers complex in Saudi Arabia, an attack the United States has long blamed solely on Hezbollah and its Iranian sponsors.

So why isn't Nasrallah listed on the FBI's Most Wanted Terrorists page?