From the NYT:

The military acknowledged Friday in a briefing for a ranking Senate Republican that news articles written by American troops had been placed as paid advertisements in the Iraqi news media and not always properly identified.

 Senator John W. Warner of Virginia, who heads the Senate Armed Services Committee, told reporters after receiving a 25-minute briefing from officials at the Pentagon that senior commanders in Iraq were trying to get to the bottom of a program that apparently also paid monthly stipends to friendly Iraqi journalists.

Here's Friday's NYT story on the Senate asking for an explanation.