Hans Blix, the former chief UN weapons inspector, slammed the Iraq war as a "tragedy" and blamed it on leaders ignoring the facts, in a comment piece published Thursday.

Writing in The Guardian on the five-year anniversary of the US-led invasion of Iraq, Blix, who clashed with Washington in the run-up to the Iraq war, described the war as "a tragedy -- for Iraq, for the US, for the UN, for truth and human dignity."

In the sub-headline to the comment piece, Blix, who headed the UN Monitoring, Verification and Inspection Commission, wrote that responsibility for the war "must lie with those who ignored the facts five years ago".

At the time of the Iraq war, Blix accused the US and Britain of exaggerating the threat from Iraqi dictator Saddam Hussein's alleged "weapons of mass destruction" -- traces of which have never been found.

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