South Korea's Yonhap news agency said the strong jamming signals have been transmitting from the northern border city of Keasong since last week.
The purported purpose of the jamming was to disrupt navigational devices using Global Positioning Systems as a major joint military exercise is under way northwest of Seoul.
The jamming is believed to have prevented some U.S and South Korean bombs from hitting their targets during a military drill."
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Cyber Defense
The US military is preparing for 21st Century electronic warfare and cyber terrorism. A joint US Cyber Command and four service cyber commands have been set up.
Their mission is to defend American military networks and civilian American infrastructure from cyber terrorism and from foreign government hackers.
The officers leading these cyber commands explain how they are organized, how they operate, and how they will protect the United States from foreign military hackers, intelligence agencies, and cyber terrorists.
