Campaigners have claimed that the Chilcot Inquiry into the Iraq War had paid only "derisory" attention to Iraqi casualties in the conflict.
The UK-based Iraq Body Count project, which compiles figures for Iraqi civilian deaths since the 2003 invasion, suggested a separate full judicial inquiry into all those killed or injured in Iraq might be needed.
The group said the Chilcot Inquiry had "obsessed minutely" about battles between politicians and generals in Whitehall to the "detriment" of everything else.
"One would almost think that the Iraq war largely took place in Britain," it said in a statement.
Iraq Body Count said it received a letter from inquiry chairman Sir John Chilcot in November, in which he said the information collated by the group would be "very useful" for him and his team.
Former armed forces minister Adam Ingram admitted in his evidence to the inquiry last month that the British Government probably should have tried to establish how many Iraqi civilians were killed in the war.
But he said: "Establishing that fact wouldn't have altered where we were because we couldn't, in one sense, easily have stopped the civilian casualties... The establishment of the facts probably should have been carried out by elsewhere in Government. I don't really think it was a Ministry of Defence function in that sense."
Mr Ingram also said British lives would have been put at risk to make an accurate calculation of the number of Iraqi deaths in the conflict.
He said: "If I had been asked as the minister of the armed forces 'are you prepared to put units in every one of the hospitals to count the bodies in and the bodies out?' and it was my choice, 'no' would have been my answer."
Iraq Body Count has recorded up to 106,000 documented violent Iraqi civilian deaths since 2003, although the true figure is likely to be much higher.
