I REUTERS 03/14/2013 Iraq War Cost U.S. More Than $2 Trillion, Could Grow to $6 Trillion, Says Watson Institute Study By Daniel Trotta NEW YORK, March 14 (Reuters) -The U.S. war in Iraq has cost $1.7 trillion with an additional $490 billion in benefits owed to war veterans, expenses that could grow to more than $6 trillion over the next four decades counting interest, a study released on Thursday said. The war has killed at least 134,000 Iraqi civilians and may have contributed to the deaths of as many as four times that number, according to the Costs of War Project by the Watson Institute for International Studies at Brown University. When security forces, insurgents, journalists and humanitarian workers were included, the war's death toll rose to an estimated 176,000 to 189,000, the study said. The report, the work of about 30 academics and experts, was published in advance of the 10th anniversary of the U.S.-led invasion of Iraq on March 19, 2003. It was also an update of a 2011 report the Watson Institute produced ahead of the 10th anniversary of the Sept. 11 attacks that assessed the cost in dollars and lives from the resulting wars in Afghanistan, Pakistan and Iraq. The 2011 study said the combined cost of the wars was at least $3.7 trillion, based on actual expenditures from the U.S. Treasury and future commitments, such as the medical and disability claims of U.S. war veterans. That estimate climbed to nearly $4 trillion in the update. The estimated death toll from the three wars, previously at 224,000 to 258,000, increased to a range of 272,000 to 329,000 two years later. Excluded were indirect deaths caused by the mass exodus of doctors and a devastated infrastructure, for example, while the costs left out trillions of dollars in interest the United States could pay over the next 40 years. Page I 1 of 2 EFTA00591158