WASHINGTON — The White House said Thursday that the declassification and release of thousands of pages of government documents related to unidentified aerial phenomena is moving forward, with a formal release expected before the end of the quarter.

A senior administration official confirmed the timeline but declined to specify which agencies are involved in the final review process, citing ongoing interagency coordination.

"The American public has waited a long time for this," the official said. "We are committed to releasing what we can."

The announcement follows years of incremental disclosures from the Pentagon and the Office of the Director of National Intelligence, which have acknowledged the existence of UAP task forces and confirmed that hundreds of incidents logged by military personnel remain unexplained.

Congressional sources familiar with the review say some documents will be released in full while others will be partially redacted due to concerns over sources and methods. The volume of material flagged for release is described as substantial.

Senator Mark Tilden, a member of the Armed Services Committee who has been briefed on the files, declined to discuss specifics but said the contents were "more detailed than most people expect."

Public polling consistently shows that a majority of Americans believe the government holds information about UFOs that has not been made public. Advocacy groups have pressed for full disclosure since the early 1990s.

No release date has been officially confirmed. The White House said further details would be provided through the appropriate channels.