Alien bodies allegedly hidden by the U.S. government. Suspected Pentagon cover-ups of secret spending programs. Retaliation against any official who dares speak out. Perhaps no congressional briefing offers up more titillating claims — or does less to illuminate them — than one about UFOs.

On Friday, members of Congress entered such a session with burning questions, only to receive hedged answers that they said did little to demystify what the government knows about extraterrestrial beings.

The closed-door briefing with Thomas A. Monheim, the inspector general of the intelligence community, was supposed to help members of the House Oversight Committee understand if there was any credibility to the bombshell claims made by a high-profile whistleblower in July.