North Korea 'jamming GPS signals' near South border

North Korea is using radio waves to jam GPS navigation systems near the border regions, South Korean officials said. The broadcasts have reportedly affected 110 planes and ships, and can cause mobile phones to malfunction. The South's unification ministry spokesman Jeong Joon-hee was quoted by AFP news agency as saying it was an "act of provocation". Tensions have been high between the two Koreas since the North's fourth nuclear test in January.
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