Meanwhile it has emerged - as a result of detective work on the internet by a Guardian reader - that the explosion in a Baghdad market which killed more than 60 people last Friday was indeed caused by a cruise missile and not an Iraqi anti-aircraft rocket as the US has suggested. A metal fragment found at the scene by British journalist Robert Fisk carried various markings, including "MFR 96214 09". This, our reader pointed out in an email, is a manufacturer's identification number known as a "cage code". Cage codes can be looked up on the internet (www.gidm.dlis.dla.mil), and keying in the number 96214 traces the fragment back to a plant in McKinney, Texas, owned by the Raytheon Company. Raytheon, whose headquarters are in Lexington, Massachusetts, aspires "to be the most admired defence and aerospace systems supplier through world-class people and technology", according to its website (www.raytheon.com). It makes a vast array of military equipment, including the AGM-129 cruise missile which is launched from B-52 bombers.