Anchor: Global Positioning System, or GPS, signals are being interrupted in South Korea due to satellite signal disruptions from North Korea. The government has warned the North to stop the latest provocation, while the South Korean Defense Ministry said it believes that Pyongyang will continue the interruptions for a while. 
Our Park Jong-hong reports.
 
Report: South Korea has urged for caution in the Seoul metropolitan area and eastern Gangwon Province after it detected a large amount of satellite disruption signals coming from North Korea.

Seoul’s Ministry of Science, ICT and Future Planning on Thursday evening raised its alert level against such disruption signals by one notch in its four-tier warning system.

GPS interference occurs when radio waves disrupt signals from satellites. The jamming can disrupt telecommunications networks and GPS signals used by airplanes and ships. 

As of Friday morning, more than 100 planes and ships reported that they experienced jamming. The Sokcho Coast Guard in charge of waters off South Korea's northeastern shores said 71 fishing vessels among some 330 had to return to the port due to GPS malfunctions.

Officials said the interference is coming from near Mount Geumgang and the city of Haeju in North Korea.
 
GPS disruptions have occurred three times since 2010 and they all appeared to have originated in the North.

Seoul's Defense Ministry said Pyongyang is continuing to jam GPS signals in a bid to raise tensions. It added that it is likely the North will continue the satellite signal disruptions for a while.

The Unification Ministry called on the North to immediately halt the activity, calling it a provocation.
Park Jong-hong, KBS World Radio News.