NEW YORK - A U.S. probe of Iraq's reconstruction contracting, a $125 billion American-led effort, has expanded to include activities of senior U.S. military officers, The New York Times reports. Citing court documents and interviews with senior government officials, the newspaper said Saturday the investigation is looking into the activities of Col. Anthony Bell, a retired U.S. Army officer who oversaw reconstruction contracting in Iraq in 2003 and 2004. The investigation is also focusing on Air Force Lt. Col. Ronald Hirtle, who served as a senior contracting officer in Baghdad in 2004, the Times said. Both men said they had nothing to hide, the newspaper reported, but officials said criminal cases indicate corruption was rife in the operations the two helped oversee. Investigators are reviewing information provided by American arms dealer and contractor Dale Stoffel, who was shot and killed in Iraq in 2004 after describing large amounts of cash being delivered secretly in pizza boxes to U.S. contracting offices in Baghdad, and paper bags full of money being left in "dead drops" in Green Zone. Stoffel had been granted limited immunity from prosecution in return for the information, government documents obtained by the Times indicated. The newspaper said Stoffel's attorney, John Quinn, confirmed the arrangement and said there is no evidence Stoffel's death was related to the alleged corruption in Iraq.