It comes after reports in local media about increased activity at the North`s Punggye-ri nuclear test site, where the previous nuclear tests took place.
A new test would be further defiance of tougher sanctions imposed by the UN last month.
"We are in a situation, in which we don`t know whether North Korea could stage provocation as a move to overcome its isolation and to consolidate its internal unity," Ms Park said told her top aides, Yonhap reported.
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