The Central Intelligence Agency withheld information about a secret counterterrorism program from Congress for eight years on direct orders from former Vice President Dick Cheney, the agency’s director, Leon E. Panetta, has told the Senate and House intelligence committees, two people with direct knowledge of the matter said Saturday.

The report that Mr. Cheney was behind the decision to conceal the still-unidentified program from Congress deepened the mystery surrounding it, suggesting that the Bush administration had put a high priority on the program and its secrecy.

Mr. Panetta, who ended the program when he first learned of its existence from subordinates on June 23, briefed the two intelligence committees about it in separate closed sessions the next day.

Efforts to reach Mr. Cheney through relatives and associates were unsuccessful.

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The disclosure about Mr. Cheney’s role in the unidentified C.I.A. program comes a day after an inspector general’s report underscored the central role of the former vice president’s office in restricting to a small circle of officials knowledge of the National Security Agency’s program of eavesdropping without warrants, a degree of secrecy that the report concluded hurt the effectiveness of the counterterrorism surveillance effort.

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Intelligence and Congressional officials have said the unidentified program did not involve the C.I.A. interrogation program and did not involve domestic intelligence activities. They have said the program was started by the counterterrorism center at the C.I.A. shortly after the attacks of Sept. 11, 2001, but never became fully operational, involving planning and some training that took place off and on from 2001 until this year.

“Because this program never went fully operational and hadn’t been briefed as Panetta thought it should have been, his decision to kill it was neither difficult nor controversial,” one intelligence official, who would speak about the classified program only on condition of anonymity. “That’s worth remembering amid all the drama.”

Members of Congress have differed on the significance of the program, whose details remain secret. Most of those interviewed, however, have said that it was an important activity that they felt should have been disclosed.