Relevant section from the WSJ article for anyone interested:
In the new report, which was completed last week, the U.S.’s National Intelligence Council, a group of veteran intelligence analysts, said it assessed with “low confidence” that a handful of Unrwa staffers participated in the Oct. 7 attack, those familiar with the findings said.
A low-confidence assessment indicates that the U.S. intelligence community believes the claims are plausible but cannot make a stronger assertion because it doesn’t have its own independent confirmation. The U.S. concluded the claims are “credible,” a U.S. official said.
U.S. officials said that American spy agencies haven’t traditionally focused on gathering intelligence on Gaza, and that Israel hadn’t shared the raw intelligence behind its assessments with the U.S., limiting their ability to reach clearer conclusions.