US Mistakes Could Let Blackwater Killers Off Hook

The incident was a significant low point for the United States during the Iraq War and inflamed anti-American sentiment abroad. The government has since been pursuing the Blackwater contractors, who had been hired to provide security for Americans in the war zone. 

The case against the company initially appeared straightforward, according to testimony and interviews of the FBI who were immediately sent to the scene to investigate. But over the years, prosecutors have lost traction on the case, according to the Times.
To date, authorities have indicted five security guards on manslaughter and weapons charges, and a sixth entered a plea deal to testify against former colleagues. Charges against one contractor were dropped last year because of lack of evidence. More