[John H K]

such as the straits between the Agean and Black seas in Turkey, the Straits of Hourmuz in the Persian Gulf, the Straits of Gibraltar, etc, etc.

The Bosporus is narrow enough that it could be rendered unnavigable by a sunken ship, I believe; the Straits of Gibraltar are not.

And even then it's hardly permanent; even in World War II where the Germans controlled ports like Cherbourg and Antwerp, and had months to mine them, sink ships, wreck dock equipment, the ports were open again in months (required a lot of work, of course.)

[BOBWADE]

Just imagine the damage from a couple tanker of oil broken up in CA or Va? It wouldn't kill very many but could further damage our economy.

[Chad Fairbanks]

Well, who's to say they'd use the LNG or oil for their purpose? I had family in Nova Scotia when the Mont Blanc, an Ammo ship, exploded in Halifax - killed by the resultant "tidal wave" that wiped out their village...

A lot of damage could be done with a ship - I wouldn't dismiss this casually, but then I wouldn't get paranoid either ;0)