There are two things you could mean by that. 1. they are financing terrorists who are killing American soldiers or 2. they are actually killing American citizens. For 1, we're killing their guys, and we most likely sent that new virus which messed with their nuke program. And if you want to say 2 is happening, back it up with a credible source.
You want evidence? Ok. Here you go: http://www.nytimes.com/2007/07/03/wo...iraq.html?_r=1