The picture of McGuiness with a luger they didn't use to illustrate the story.
Lord Saville of Newdigate's tribunal was told that Mr McGuinness, Sinn Fein MP and the party's chief negotiator, had admitted opening fire with a Thompson sub-machine gun "precipitating" the killing of the civilians by British Army paratroopers in Londonderry.
Mr McGuinness has so far refused to co-operate with the inquiry, which was told that he was reputedly the commander of the Provisional IRA in the city at the time of the shooting on 30 January 1972.
Mr McGuinness is seeking legal advice on whether to give evidence. He said the shooting claims against him were "a pathetic fabrication" and an attempt by the British Army to divert attention from their own culpability over the killings.
Mr Christopher Clarke QC, counsel to the inquiry, told of security service documents implicating Mr McGuinness. One message which came from The Hague, dated April 1984, described the debriefing of an informer, code named "Infliction". It stated: "McGuinness had admitted to Infliction that he had personally fired the shot (from a Thompson machine gun on single shot) from Rossville Flats in the Bogside that had precipitated the Bloody Sunday episodes."
Another classified document, produced a month later, referred to a conversation with another senior member of the Provisional IRA who confirmed that Mr McGuinness fired the shot.