The move, coming as Attorney General Merrick B. Garland appears to be ramping up the pace of his painstaking investigation into the Capitol riot, is the clearest sign yet of a wide-ranging inquiry at the Justice Department.

The House committee has interviewed more than 1,000 people so far, and the transcripts could be used as evidence in potential criminal cases, to pursue new leads or as a baseline text for new interviews conducted by federal law enforcement officials.

Aides to Representative Bennie Thompson, Democrat of Mississippi and the chairman of the committee, have yet to reach a final agreement with the Justice Department on what will be turned over, according to a person with knowledge of the matter who spoke on the condition of anonymity because of the confidential nature of the investigations.

On April 20, Kenneth A. Polite Jr., the assistant attorney general for the criminal division, and Matthew M. Graves, the U.S. attorney for the District of Columbia, wrote to Timothy J. Heaphy, the lead investigator for the House panel, advising him that some committee interviews "may contain information relevant to a criminal investigation we are conducting."

Mr. Polite and Mr. Graves did not indicate the number of transcripts they were requesting or whether any interviews were of particular interest. In their letter, they made a broad request, asking that the panel "provide to us transcripts of these interviews, and of any additional interviews you conduct in the future."

Spokesmen for the Justice Department and the House committee declined to comment.