There is a lot in the report (2.6 million words over 12 volumes) that's mentioned here.
Chairman Sir John Chilcot said the 2003 invasion was not the "last resort" action presented to MPs and the public.
There was no "imminent threat" from Saddam - and the intelligence case was "not justified", he said.
The report, which has taken seven years, is on the Iraq Inquiry website.
...
Previously classified documents, including 31 personal memos from Tony Blair to then US president George W Bush, have been published alongside the Chilcot Report.
...
The memos reveal that Mr Blair and Mr Bush were openly discussing toppling Saddam Hussein as early as December 2001, when the UK and US had just launched military action in Afghanistan.
"How we finish in Afghanistan is important to phase 2. If we leave it a better country, having supplied humanitarian aid and having given new hope to the people, we will not just have won militarily but morally; and the coalition will back us to do more elsewhere," says Mr Blair in the memo.
"We shall give regime change a good name which will help in our arguments over Iraq."
In January 2002, President Bush named Iraq as part of what he described as an "axis of evil" in what he said was a "war on terror" against al-Qaeda and other groups.