North Korea--North Korea fired a short-range missile into the sea and tried to jam GPS navigation signals in South Korea on Friday, Seoul officials said, hours after U.S., South Korean and Japanese leaders pledged to work closer together to prevent North Korea from advancing its nuclear and missile programs.
Officials said the attempt to jam GPS signals, which began Thursday, did not cause any major disruptions of South Korean military, aviation and sea transport and telecommunication systems. However, more than 130 fishing boats reported problems with their navigation systems and some were forced to return to their ports, the Ministry of Oceans and Fisheries said.
South Korea's Defense Ministry called the jamming attempt a provocation that threatened public safety and military operations in the South. A ministry statement warned North Korea to immediately stop the jamming efforts or face unspecified consequences.
South Korea has blamed North Korea for several previous jamming attempts. This week's jamming signals are the first since 2012, according to South Korea's Science Ministry. North Korean state media had no immediate comment.
North Korea also fired a surface-to-air missile off its east coast on Friday, three days after it launched a projectile that hit land in its northeast, South Korea's Joint Chiefs of Staff said without elaborating.
Also, North Korea has officially announced it is blocking Facebook, YouTube, Twitter and South Korean websites in a move underscoring its concern with the spread of online information.
The Ministry of Posts and Telecommunications announcement was posted this week at the country's main mobile service provider, Koryolink, and other places serving Internet users.
Very few North Koreans have Internet access. Typically they can see only a sealed-off, government-sanctioned intranet. But foreigners had previously been able to surf the Web with almost no overt restrictions, though most likely with behind-the-scenes monitoring of their Internet activities.