New details of Blackwater participation in clandestine CIA raids detail the extent to which private security contractors were involved in covert government antiterror operations.

According to former employees and current and former American intelligence officials, who agreed to speak on condition of anonymity because they feared repercussions, Blackwater security guards participated in clandestine raids to capture or kill suspected insurgents in Iraq and Afghanistan and in transportation of detainees on CIA flights.

The raids against suspects were said to occur almost nightly between 2004 and 2006, the height of the Iraqi insurgency. Several of the former Blackwater employees said the lines dividing the government-sanctioned agencies (the CIA and the military) and Blackwater began to blur.

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