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How many people knew of this?

The public speculation about a potential war between the U.S. and Iran have added to that anxiety, as have incidents like the taking of the British marines and an earlier event in March when the Saudi Arabian navy engaged an Iranian submarine. No shots were fired but the Saudis found the sub near the Saudi city of Jubail, a coastal industrial center that is the site of major Saudi petrochemical and oil installations, as well as the location of the King Abdul Aziz naval base. The Saudis minimized the incident, accepting the Iranian explanatin that the sub's closeness to Jubail was a mistake. The Saudis also did not want to further stress relations between Riyadh and Tehran. But an Arab surce in the gulf believes that the incident may have been an Iranian political message to the U.S. and the world — a reminder that Iran has assets in the gulf to threaten American and its allies there.