TOKYO (Sputnik) — The previous upgrade of the alert took place following North Korea’s nuclear test last month.
"We believe there's a larger possibility that North Korea may launch cyberattacks on the South, and recently upgraded our Information Operation Condition," the official said as quoted by Yonhap news agency adding that no attacks have been registered so far.
On January 6, Pyongyang said it had successfully carried out a hydrogen bomb test which triggered a wave of condemnation from the international community.
On February 7, North Korea launched a Kwangmyongsong-4 satellite atop a long-range rocket, defying a UN Security Council resolution which bans Pyongyang from launching rockets that could be used as ballistic missiles carrying nuclear warheads.
