And they will hit a target of high political/cultural value here in the USA. If I were a casino owner in Las Vegas, NV I would step up security substantially before a terrorist drives a passenger minivan loaded with explosives in front of a casino entrance and detonates the bomb, which could kill hundreds of people.
Fox is reporting an unknown group.....in the name of Al Qaeda is claiming this bombing.
I think they'll do the exact same thing they do in Israel and now London- head for buses and trains where they can do immediate killings. In larger cities, it would be so easy for them to blend in with the rest of the crowd.