The Central Intelligence Agency in 2004 hired outside contractors from the private security contractor Blackwater USA as part of a secret program to locate and assassinate top operatives of Al Qaeda, according to current and former government officials. Executives from Blackwater ... helped the spy agency with planning, training and surveillance. The C.I.A. spent several million dollars on the program, which did not successfully capture or kill any terrorist suspects. It is unclear whether the C.I.A. had planned to use the contractors to actually capture or kill Qaeda operatives, or just to help with training and surveillance in the program. American spy agencies have in recent years outsourced some highly controversial work, including the interrogation of prisoners. But government officials said that bringing outsiders into a program with lethal authority raised deep concerns about accountability in covert operations. Officials said the C.I.A. did not have a formal contract with Blackwater for this program but instead had individual agreements with top company officials, including the founder, Erik D. Prince, a politically connected former member of the Navy Seals and the heir to a family fortune. Over the years, Blackwater has hired several former top C.I.A. officials, including Cofer Black, who ran the C.I.A. counterterrorism center immediately after the Sept. 11 attacks. C.I.A. operatives also regularly use the company's training complex in North Carolina. The complex includes a shooting range used for sniper training.