Some government agencies are standing in the way of efforts to catalog reports of “unidentified aerial phenomenon,” Politico reports, citing several current and former government officials.

Back in 2017, reports emerged of a secretive Pentagon program that was tasked to look into unexplained UFO sightings in military airspace. Several of these incidents were caught on video, and in January, the CIA declassified every file it claims to have on these sightings.

But government employees tasked with looking into the incidents are now claiming that agencies are not releasing relevant information, in some cases resisting the release of any classified information.

And it’s not just active resistance.

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