Respectfully, I'm not so sure. They kidnapped Brits, not Americans.
Americans are getting either kidnapped and killed almost every day in Iraq. Quite a few of the insurgents doing the killing came from neighboring countries. Also, some of the Shiite sects causing civil unrest also have ties to Iran. Looks like the Iranians incited this incident to ratchet hostilities up a notch. They now are making it clear where a lot of the killing and kidnapping inside Iraq is coming from. Been unclassified for awhile and now the whole world knows.