The British Government wrote to the intelligence and security services to admit there were failings in its controversial second dossier on Iraq's weapons, it has emerged.
A Downing Street spokesman said Alastair Campbell, Prime Minister Tony Blair's director of communications, told the agencies "far greater care" would be taken in dealing with anything which might impact on their reputation and work.
February's dossier - the second on Iraq - was widely criticised when it emerged part of it was copied from a 12-year-old thesis by an American student.
The first document to make the case for war, published last September, is being investigated by MPs.
Downing Street has denied Mr Campbell's intervention amounts to an apology.