Under present circumstances, I feel that one could easily "over think" what the exact target might be.

It remains to be seen how accurate hastily developed missiles will be. I consider it probable that the target might well be "America" rather than a particular bridge, dam, power plant, or other strategic target.

Whilst we know that they have the bomb, and also have long range missiles, it is possible that bombs small and light enough to be delivered by missile are not yet available.

Other modes of delivery exist including a Bomb delivered by cargo ship and onward by a trucking firm, or a Bomb dropped from a modified civilian airliner on an apparently legitimate flight to a USA airport. Or a short range missile fired from a ship.