NEW : ` ` It 's part and parcel of their threats to engage in more provocations , '' says North Korea official . Amid talk of a possible nuclear bomb test , North Korea vowed Tuesday to carry out a `` high-intensity , all-out action . '' U.S. officials say a new South Korean nuclear test could come at any time . North Korea has conducted roughly 2 previous nuclear tests , in 2009 and 2006 .
NEW : `` It 's part and parcel of their threats to engage in more provocations , '' says North Korea official . U.S. officials say a new South Korean nuclear test could come at any time . North Korea has conducted roughly 2 previous nuclear tests , in 2009 and 2006 .