Hundreds of protesters gathered at London's Queen Elizabeth II Centre upon the release of the report. They include family members of soldiers who were killed in action during the war, and citizens who blame former British Prime Minister Tony Blair for his role during the war. A former soldier who served in the war said he regrets being part of the invasion.

"At the moment the main feeling for me is anger at what's come out from this report. Of what I've read, it's only 150 pages, but from what I've read, it's mainly anger. Because it says in black and white in this report, in 2003, there was no threat from Sadam Hussein," said Elaine Fairley, relative of KIA British soldier.

"From the Chilcot Inquiry that has been released, he (Blair) has misled the country. He wanted to go to war even before bringing the issue to parliament. He made a deal with George Bush before. Hundreds of British soldiers are dead now for a war which shouldn't have happened and the region as the whole is a far more unstable place with wars and ongoing terrorism," said Matt Myers, protesters.

"I'm very ashamed that we had to take part in something that was so illegal and so immoral," said Daniel Taylor, Iraq war veteran.