U.S. intelligence officials reviewing dozens of reports of mysterious flying objects found 18 in which the objects displayed no visible propulsion or appeared to use technology beyond the known capabilities of the U.S. or its adversaries, according to an intelligence report released Friday.

The reports of “unidentified aerial phenomena” weren’t offered as evidence of alien activity on Earth, though that prospect wasn’t definitively ruled out.

“We have no clear indications that there is any nonterrestrial explanation,” a U.S. official said. Instead, officials said greater technological understanding may be required to determine what was behind many of the unexplained cases.

“Some of those could require some scientific advances on our part to allow us to better understand what it is that we’re observing,” another official said. “It’s clear that we need to improve our capacity to further analyze remaining observations.”

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