1. Terrorists are warning of another even bigger hit on the US.
2. Rumors of Scuba purchasing terrorists in NY and Miami.
3. Hatred of the Jews.
4. To kill lots of people, you need lots on people in a small three dimensional volume. Flat concentrations are too spread out.
5. To kill lots of people, they need to be contained so they can'y get away from fire, etc.
6. Two containers meet the bill, large highrise buildings, and large cruise ships. Highrise building must be hit on weekdays when they're full, but emergency services are available. Cruise ships can be hit on a weekend when emergency services are much less available.
7. I think a large cruise ship will be hit on a Sunday, probably in port just as it's ready to leave. It will be in Port Miami, on the world's largest cruise ship the Royal Caribbean Voyager (4 to 5 thousand on board including crew). A very high percentage of Jews will be onboard.
8. Attack will be from below the water, above the water, and on board, and possibly from the air.
8. I hope I'm totally wrong.
Not if they hit the nearest trauma center(s) simultaneously.