Iran's hand in Iraq is not a question, its a fact. However all these sources seemed to omit the administration expressing its faith in the Iranian leadership in its efforts to stop these flow of arms. The sounds bytes of this were dropped from most news channels over here because it didn't make for exciting and controversial news.

Something else nobody wants to pony up to is Iran's long term goals with Syria and Lebanon. There were published and confirmed intelligence reports for years before the mess in Iraq about Iran's Middle East strategy. Iranian Clerics and government officials were upset with 9/11, not because of it occurring, but because of the timetable and its delivery without proper warnings (the proper warnings being debated between the camps on a regular basis, but basically shadow to forgo the substance). However, this has also resulted in an added benefit as seen in the invasion of Iraq and the turmoil and violence that not only tarnishes US diplomatic currency(not based on reality, but on the global marketing of the conflict) but they know when Iraq does stabilize itself, it will have a shia majority making their goals with Syria that much easier to obtain. The aim has been and will continue to be the destruction of Israel. Any argument to the contrary is ignorant.

The U.S. and its current administration is not saber rattling and itching for a fight with Iran. Iran knows where we stand on the important issues, there is no doubt here and Iran knows that if it came to armed conflict the war in Iran would be a very different thing than the war in Iraq. The U.S. doesn't want this and Iran doesn't want this. It flies in the face of both agendas. Of course we'll see both sides at times step out of box to earn diplomatic currency, but thats it.