London: Washington on Sunday came under increasing pressure to investigate the allegations in the leaked Iraq war documents published by WikiLeaks, which Britain`s deputy premier called "shocking".
Governments and human rights organisations alike put the focus on answers to the allegations made against US, allied and Iraqi troops as the whistleblowing website released 400,000 classified US military documents.
The flood of material from 2004 to 2009 offers a grim snapshot of the conflict, especially of the abuse of Iraqi civilians by Iraqi security forces.
The heavily redacted logs appear to show that the US military turned a blind eye to evidence of torture and abuse of civilians by the Iraqi authorities.
WikiLeaks claims the documents reveal around 15,000 more civilian deaths than were previously known about.
British Deputy Prime Minister Nick Clegg called the allegations "extremely serious" and said people would want to hear "what the answer is".
"We can bemoan how these leaks occurred but I think the nature of the allegations made is extraordinarily serious. They are distressing to read about," he told BBC television.
"I`m assuming the US administration will want to provide its own answer. It`s not for us to tell them how to do that.
"Anything that suggests that basic rules of war and conflict and of engagement have been broken or that torture has in any way been condoned are extremely serious and need to be looked at.
"People will want to hear what the answer is to what are very, very serious allegations of a nature which I think everybody will find quite shocking."
Australia joined Iraq war allies Britain and the United States in saying that the leaks could put troops` lives at risk.
Australian Defence Minister Stephen Smith vowed a "painstaking" review of the documents, while warning they could compromise operational security and threaten the safety of collaborators.
Smith said Australia was likely to be less affected than its larger partners in Iraq. Some 20,000 Australian troops served in the conflict.
The files published Friday contain graphic accounts of torture, civilian killings and Iran`s hand in the Iraq war, documenting years of bloodshed and suffering following the 2003 US-led invasion to oust dictator Saddam Hussein.
Other reports describe Iraqis beating prisoners and women being killed at US military checkpoints.
On Iran`s role in the Iraq conflict, the latest files show Tehran waging a shadow war with US troops in Iraq and Tehran allegedly using militias to kill and kidnap US soldiers.
Human Rights Watch said Iraq should investigate reports that its forces systematically tortured and abused detainees.
"Iraq should prosecute those responsible for torture and other crimes," the rights ombudsman said in a statement.
"The US government should also investigate whether its forces breached international law by transferring thousands of Iraqi detainees from US to Iraqi custody despite the clear risk of torture."
Amnesty International called on Washington to investigate how much US officials knew about the alleged torture and other ill-treatment of detainees held by Iraqi security forces.
Spokesman Malcolm Smart said the leaks fuelled concerns that US authorities "committed a serious breach of international law when they summarily handed over thousands of detainees to Iraqi security forces who, they knew, were continuing to torture and abuse detainees on a truly shocking scale."
The rights ministry in Baghdad said the logs "did not contain any surprises".
WikiLeaks held a news conference in London on Saturday, at which the website`s founder Julian Assange defended the unauthorised release, saying the documents revealed the "truth" about the conflict.
"This disclosure is about the truth," Assange said after the logs were published on the Internet.
"The attack on the truth by war begins long before war starts, and continues long after a war ends," he said, adding that WikiLeaks hoped "to correct some of that attack on the truth".
"Most wars that are started by democracies involve lying.
"If there`s enough truth early on enough then perhaps we won`t see these kind of wars."
Assange said the documents showed the war had been "a bloodbath on every corner".
WikiLeaks spokesman Kristinn Hrafnsson said the website would release a further 15,000 secret files "soon" on the war in Afghanistan.
WikiLeaks enraged Washington by releasing 77,000 documents on the Afghan war in July.
A Pentagon spokesman said the documents were "essentially snapshots of events, both tragic and mundane, and do not tell the whole story."