I think this whole episode is a non-issue, and will be resolved shortly. I've thought that since it was reported early this morning. But I do think the Iranians may have sabotaged Iraq's pipeline. And it doesn't mean that Iran can't have clandestine activity going on that they'd like other's to keep their noses out of.
In other times it could have been a non-issue, but thumbing their nose at us while the people here are angry over the beheadings, and our government is angry over their nuclear programs, is either bad timing, a sign of significant hostility on their part, part of an overall increase in maritime security, air defense, or both, or perhaps a combination of all the above.