South Korea braced for a possible further missile test by North Korea when it marks its founding anniversary Saturday, just days after its sixth and largest nuclear test, which it marks each year with a big display of pageantry and military hardware.

Throughout the week, South Korean officials have warned the North could launch another intercontinental ballistic missile, in defiance of U.N. sanctions and amid an escalating standoff with the United States.

Last year, North Korea conducted its fifth nuclear test on the Sept. 9 anniversary.