South Korea’s National Intelligence Service (NIS) on Friday expressed concern that the miniaturization of nuclear weapons is faster than expected at National Assembly’s Intelligence Committee, Yonhap reported.

The emergency meeting of the Intelligence Committee, held just a few hours after the North Korea conducted its fifth nuclear test and its second of the year, was presented by the director of the NIS Lee Byung-ho, according to an unnamed NIS official.

On the same day, an artificial earthquake with a magnitude likely over 5.0 on the Richter Scale was detected near the DPRK’s Punggye-ri testing site.

The North’s aim is to