The USA would probably want an apology if the situation were reversed. I'm not going to sweat it too much unless they start asking for more groveling on top of this apology demand.
The story the Obama administration is telling about this couldn't possibly be true. There's no way all four engines on those boats could have gone out at the same time, and one could easily tow the other. What probably happened is that the Iranians encroached Saudi waters and kidnapped the sailors. Obama, in his usual craven fashion, doesn't want to pass off the Iranians, so he's lying about what happened.
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