U.S. - Iranian waltz (dance of death) could trigger war?

"On Jan. 20, militants kidnapped and killed four American soldiers in a raid in Karbala, and a fifth was killed in the firefight. A U.S. defense official said one possibility under study is that Iranian agents either executed or masterminded the attack, a suspicion based on the sophisticated and unusual methods used in the attack, including weapons and uniforms that may have been American." What ? Based on what? Where's the real evidence here?

Also - "There has been speculation that the Karbala assault may have been in retaliation for the arrest of five Iranians by U.S. troops in northern Iraq." Really? Who would have thought?

A #2 U.S. general told USA Today that Iran was supplying Iraqi Shiite militias with a variety of powerful weapons. "We have weapons that we know through serial numbers ... trace back to Iran," Lt. Gen. Raymond Odierno said. Give me a break. Haven't we heard this kind of bullshit before?