North Korea’s next nuclear test may come as early as next month, after China’s party congress and ahead of the U.S. midterms, South Korean lawmakers said after a briefing with the National Intelligence Service (NIS) on Wednesday.

The NIS reportedly shared the assessment with two ranking members of the National Assembly’s intelligence committee in the closed-door meeting.

“The chances of a nuclear test have increased,” Yoo Sang-beom of the ruling People Power Party said during a press briefing, citing the intelligence agency.

“We asked the NIS about that, and they said it is highly plausible that, if a test occurs,