"On the Chilcot Inquiry, nothing has changed in terms of my view, but I'm not in control of when this report is published. It's an independent report," Cameron said at a joint press conference with the Turkish prime minister in Ankara.
The announcement raised concerns that a Privy Counsellor Sir John Chilcot's report, which is already four years overdue, will not be made public before next year, as promised earlier by the UK prime minister.
Blair, a Labor prime minister, was the one who sent UK troops to Iraq in 2003. It is widely believed that the report can break the reputation of UK's Labor party just months ahead of the general elections in May 2015.
But Cameron said Tuesday the release of the Chilcot Inquiry was entirely up to the board of investigators, who conducted their study between 2009 and 2011. The million-word report was due to be released to the public in 2014.