North Korea jammed GPS signal in South Korea
According to some reports, North Korea was behind all this.
Communications officials could not say whether the North Korea was behind separate cyber attacks on government websites including that of the presidential Blue House and the Defense Ministry since Friday that slowed or disabled them for hours.
If the North were responsible for either or both of the incidents, it could mark an escalation of tension between the rivals already high from two attacks on South Korean territory last year and ensuing exchange of threats of war and retaliation.
North Korea was suspected of a massive wave of cyber attacks on U.S. and South Korean government and corporate websites in 2009.