The public disclosure of information about a suspected North Korean nuclear facility by Seoul’s unification minister triggered the U.S. to start restricting intelligence sharing earlier this year, South Korea’s intelligence agency has confirmed.

National Intelligence Service (NIS) Director Lee Jong-seok delivered the agency’s assessment during a briefing for the National Assembly’s Intelligence Committee on Thursday, according to lawmakers who participated.

Lee said the “restrictions applied to only a very limited portion of intelligence” and that any gaps could be sufficiently filled using the agency’s own reconnaissance assets, People Power Party lawmaker Yoo Young-ha told reporters after the meeting.

“He explained,