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Groups seeking more information about the assault have said government officials have required survivors to sign nondisclosure agreements about their accounts.

Mr. Woods is not alone in his skepticism about the official account of the attack, rendered in a long series of hearings and briefings for lawmakers and in both the secret and unclassified versions of a report written by a State Department investigative panel called an Accountability Review Board.

“We think that there was a cover-up of some kind of wrongdoing that led this administration to lie to the American people about the nature of the attack immediately after the attack, and for a week after that attack,” Rep. Dana Rohrabacher, California Republican, told Mr. Kerry at the hearing.

After pledging to work with the chairman, Mr. Kerry told Mr. Rohrbacher: “Let’s find out exactly, together, what happened, because we [have] got a lot more important things to move on to and get done.”

Part of the problem, the hearing revealed, is that officials and lawmakers sometimes have different definitions of cooperation.

Mr. Kerry, for instance, asserted that he had seen video from security cameras on the buildings and surveillance drones overhead while he was a senator.

“Video of the actual event has been made available to members to see,” he said. He made similar points about the transcripts of the FBI interviews with survivors and the names of those evacuated.

“I have to just disagree for a minute,” said Mr. Royce. “Instead of handing over copies of the documents and records that we’ve requested, as has always been customary practice in the past, the department has insisted that the committee staff sift through thousands of pages of materials in a room in which they are monitored by the department, and they can’t remove any or make electronic copies of those documents.”

He noted that the documents are unclassified.

“The department is literally spending thousands of taxpayers’ dollars a week to slow the progress of the committee’s review,” Mr. Royce said.

Other lawmakers wanted to know about the four low-level officials identified but not named in the report as having failed to show leadership as threats to the post in Benghazi mounted and the security situation in the city deteriorated.

The failures the four exhibited, the review board found, were not sufficient to fire them outright, and they remain on the payroll.

Mr. Kerry said he is “waiting for [an imminent] report to come to me which will give me a full indication of what my options are under the law following those [personnel] rules.”