The Newspaper of Record in the US has issued a broad retraction of many stories leading up to the Iraqi war.
[The problematic articles] depended at least in part on information from a circle of Iraqi informants, defectors and exiles bent on "regime change" in Iraq ... Complicating matters for journalists, the accounts of these exiles were often eagerly confirmed by United States officials convinced of the need to intervene in Iraq. Administration officials now acknowledge that they sometimes fell for misinformation from these exile sources. So did many news organizations in particular, this one.They take broad editorial responsibility for this failure of reporting and cite several articles based on faulty information. Examples online.
This admission is astonishing. Usually it's a single reporter to blame; here the NYT as a whole is saying they got it wrong. This article is an important milestone in the US coming to terms with the fact that the war on Iraq was based on false pretenses.