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Sir John Chilcot has issued a damning 2.6 million word report into Britain's decision to invade Iraq at the end of a seven-year long inquiry.

Tony Blair's policy was founded on “flawed intelligence” and the process for deciding that the 2003 war was legal was “far from satisfactory”, it found.

The Iraq Inquiry found that Mr Blair's government presented evidence about Saddam Hussein's weapons of mass destruction (WMDs) “with a certainty that was not justified” and troops were sent in before all peaceful options had been exhausted.

Presenting a summary of his inquiry's findings, Sir John hit out at the “wholly inadequate” planning for the period after the fall of Saddam, which saw British troops involved in a prolonged and bloody occupation as terrorist groups gathered power and sectarian conflict spread.

The key players in the Iraq War Show all 11 1 /11 The key players in the Iraq War The key players in the Iraq War Jack Straw Jack Straw was the UK foreign secretary at the time of the Iraq invasion, and fully endorsed the decision Getty The key players in the Iraq War Geoff Hoon Geoff Hoon was Tony Blair’s defence secretary from October 1999 to May 2005 Getty Images The key players in the Iraq War Alastair Campbell Alastair Campbell was involved in the drafting of two Downing Street dossiers on the war, in September 2002 and in February 2003 Getty The key players in the Iraq War John Scarlett John Scarlett was chairman of the Joint Intelligence Committee at the time of the 2003 invasion Getty Images The key players in the Iraq War Peter Goldsmith Peter Goldsmith was Mr Blair’s attorney general from 2001 to 2007 AFP/Getty Images The key players in the Iraq War Condoleezza Rice Condoleezza Rice was named as National Security Advisor to George W Bush in 2000, becoming the first woman to occupy the post, and argued publicly in favour of the 2003 invasion Getty Images The key players in the Iraq War Colin Powell Colin Powell was Secretary of State from 2001 to 2005 Getty Images for TIME The key players in the Iraq War Tommy Franks Tommy Franks was the leading US general at the start of the Iraq war The key players in the Iraq War Dick Cheney Dick Cheney was George W Bush’s vice president from 2001 to 2009 Getty Images The key players in the Iraq War Paul Bremer Paul Bremer ran Iraq for 14 months after the invasion, appointed Bush’s Presidential Envoy in charge of the occupying forces Getty Images The key players in the Iraq War Hans Blix Hans Blix was the UN weapons inspector tasked with monitoring Iraq from 2002 to 2003 Getty Images

The former Whitehall mandarin was setting out the findings of his inquiry into the UK's most controversial military engagement since the end of the Second World War, which left at least 150,000 Iraqis - mostly civilians - dead.

Although his inquiry did not express a view on whether the invasion was legal, Sir John criticised the way in which Mr Blair and his attorney general, Lord Goldsmith, had reached their decision on the legal basis.

Sir John said: “The circumstances in which it was decided that there was a legal basis for military action were far from satisfactory.”

Addressing the issue of WMDs, Sir John said the Joint Intelligence Committee should have made clear to Mr Blair that the intelligence had not established “beyond doubt” that Iraq had either continued to produce chemical and biological weapons or was continuing with efforts to develop a nuclear bomb.

“It is now clear that policy on Iraq was made on the basis of flawed intelligence and assessments,” Sir John said. “They were not challenged, and they should have been.”