Possible "nonhuman biological material" was found at a so-called alien crash retrieval site, a former U.S. intelligence officer and U.F.O. whistleblower told a House subcommittee on Wednesday.

The witness, David Grusch, made the comments in response to questions from Rep. Nancy Mace, R-S.C. about the alleged crash site and whether or not the bodies of the pilots were found.

The U.S. is concealing a longstanding program that retrieves and reverse engineers unidentified flying objects, a former Air Force intelligence officer testified Wednesday to Congress. The Pentagon has denied his claims.

The U.S. House Oversight Committee is set to hear from three witnesses Wednesday morning after a whistleblower filed a complaint claiming the U.S. has been concealing evidence of non-human aircraft.

The Senate in the coming days is expected to consider a bipartisan measure that would compel the U.S. government to publicly release records relating to possible UFO sightings after decades of stonewalling.

Multiple government officials have made disclosures to Congress about UFOs beyond the claims brought forward by whistleblower David Grusch, Sen. Marco Rubio (R-FL) revealed in a new interview.

A Nasa panel investigating unidentified flying objects has collected around 800 mysterious reports - but only a small fraction are truly unexplained, researchers say.

The agency set up the panel last year to explain its work on what it calls unidentified anomalous phenomena (UAP).

UAP are defined as sightings "that cannot be identified as aircraft or known natural phenomena from a scientific perspective".

The panel, which will issue a report later this year, held its first public meeting on Wednesday.

The head of the Pentagon's office tasked with tracking UFOs told lawmakers of "emerging capabilities" and "advanced tech" from potential foreign adversaries — specifically Russia and China — that "are concerning."

But there's no definitive evidence of extraterrestrial technology or alien life, Sean Kirkpatrick, the director of the All-domain Anomaly Resolution Office (AARO), said during Wednesday's Senate meeting of the Armed Services Subcommittee on Emerging Threats and Capabilities. 

The head of the Pentagon office reviewing UFO incidents reported by military personnel told Congress Wednesday that his office is now reviewing 650 incidents, but that there is no evidence that any of them is of extraterrestrial origin.

Two new videos were released at the rare open congressional hearing on Unexplained Anomalous Phenomena, or UAPs as the Pentagon calls them, to highlight how the recently established All-domain Anomaly Resolution Office (AARO) can explain some incidents but not others.

A bipartisan group of lawmakers continued their push Wednesday to solve concerns surrounding the decades-old UFO mystery.

The Senate Armed Services Subcommittee on Emerging Threats and Capabilities held the second hearing on the phenomenon in more than 50 years.

Dr. Sean M. Kirkpatrick, director of the All-domain Anomaly Resolution Office (AARO), was the sole witness for the hearing. Lawmakers asked about administrative matters, including ensuring that AARO has the necessary funding to execute its scientific mission.

Last Saturday, the North American Aerospace Defence Command (NORAD) shot down an object over Yukon — one of four mysterious objects that were downed over the U.S. and Canada this month.

That same day, Feb. 11, a small hobby club — the Northern Illinois Bottlecap Balloon Brigade (NIBBB) — received its last transmission from one of its pico balloons on its seventh circumnavigation around the world. The balloon was near Hagemeister Island, off the southwest corner of Alaska.