The New York Times reports an internal investigation by the Central Intelligence Agency has found that its officers improperly penetrated a computer network used by the Senate Intelligence Committee in preparing its report on the C.I.A.'s detention and interrogation program. In a statement issued Thursday morning, a C.I.A. spokesman said that agency’s inspector general had concluded that C.I.A. officers had acted inappropriately by gaining access to the computers. The statement said that John O. Brennan, the C.I.A. director, had apologized to the two senior members of the Senate Intelligence Committee and that he would set up an internal accountability board to review the matter. The board will be led by former Senator Evan Bayh, Democrat of Indiana. The statement gave almost no specifics about the findings of the report, written by David Buckley, the agency’s inspector general.