The private military firm Blackwater Worldwide is facing new allegations of unlawful activity in Iraq, this time for dropping a heavily restricted riot-control gas on a crowded Baghdad checkpoint in May 2005. According to the New York Times, the release of the CS gas by a Blackwater helicopter and armored vehicle temporarily blinded drivers, pedestrians and at least ten American soldiers. Blackwater is already under scrutiny for a mass shooting in Baghdad that killed seventeen Iraqis last September. Military witnesses say Blackwater personnel appeared to release the gas as a way to clear a traffic jam that was blocking their route. The gas is only authorized for use in dangerous situations. Its effects include burning and watering eyes, skin irritation, coughing and breathing difficulties, nausea and vomiting. Blackwater says it reported the incident to the U.S. embassy and that the case was investigated. But U.S. officials could not confirm that an investigation occurred.