On edge: South Korea has been on high alert against possible cyberattacks from the North.
SEOUL: North Korea's efforts to disrupt GPS signal reception in the South forced some fishing vessels to return to port on Friday, South Korea said, amid heightened tension over a recent nuclear test and rocket launch by its neighbour.
South Korea has been on high alert against possible cyberattacks from the North, after its angry rhetoric threatening war and further weapons tests in response to new sanctions imposed last month by the UN Security Council and the South.
