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SEOUL, South Korea - Raising tensions with South Korea yet again, North Korea cut its last military hotline with Seoul on Wednesday, saying there was no need to continue military communications between the countries in a situation "where a war may break out at any moment."
A senior North Korean military official informed the South that all regular military dialogue and communications channels would remain cut until South Korea halts its "hostile acts" against the North.
The hotline shutdown is the latest of many threats and provocative actions from North Korea, which is angry over U.S.-South Korean military drills and recent U.N. sanctions punishing it for its Feb. 12 nuclear test.
North Korea recently cut a Red Cross hotline with South Korea and another with the U.S.-led U.N. command at the border between the Koreas.
The link cut Wednesday had been essential in operating the last major symbol of inter-Korean cooperation: an industrial complex in the North that employs hundreds of workers from the South. It was used by the two countries' militaries to arrange for workers and shipments to cross their heavily armed border.
There was no immediate word about the impact on South Korean workers who were at the Kaesong industrial complex. When the link was last cut in 2009, many South Koreans were stranded in the North.
Outside North Korea, Pyongyang's actions are seen in part as an effort to spur dormant diplomatic talks to wrest outside aid, and to strengthen internal loyalty to young leader Kim Jong Un and build up his military credentials.
North Korea's action was announced in a message that its chief delegate to inter-Korean military talks sent to his South Korean counterpart.
"Under the situation where a war may break out any moment, there is no need to keep North-South military communications," he said. "North-South military communications will be cut off."
Seoul's Unification Ministry, which is in charge of relations with the North, called the move an "unhelpful measure for the safe operation of the Kaesong complex."
The Unification Ministry said only three telephone hotlines remain between the North and South, and those are used only for exchanging information about air traffic.
South Korean officials said about 750 South Koreans were in Kaesong on Wednesday, and that the two Koreas had normal communications earlier in the day over the hotline when South Korean workers traveled back and forth to the factory park as scheduled.
Workers at Kaesong could also be contacted directly by phone from South Korea on Wednesday.
A South Korean worker for Pyxis, a company that produces jewelry cases at Kaesong, said in a phone interview that he was worried about a possible delay in production if cross-border travel is banned again.
"That would make it hard for us to bring in materials and ship out new products," said the worker, who wouldn't provide his name because of company rules.
The worker, who has been in Kaesong since Monday, said he wasn't scared.
"It's all right. I've worked and lived with tension here for eight years now. I'm used to it," he said.
Kaesong is operated in North Korea with South Korean money and know-how and a mostly North Korean work force. It provides badly needed hard currency in North Korea, where many face food shortages.
Other examples of joint inter-Korean cooperation have come and gone. The recently ended five-year tenure of hard-line South Korean President Lee Myung-bak saw North-South relations plunge. Lee ended an essentially no-strings-attached aid policy to the North.
North Korea last cut the Kaesong line in 2009, in a protest of that year's South Korean-U.S. military drills. North Korea refused several times to let South Korean workers commute to and from their jobs, leaving hundreds stranded in North Korea. The country restored the hotline and reopened the border crossing more than a week later, after the drills were over.
North Korea's actions have been accompanied by threatening rhetoric, including a vow to launch a nuclear strike against the United States and a repeat of its nearly two-decade-old threat to reduce Seoul to a "sea of fire." Outside weapons analysts, however, have seen no proof that the country has mastered the technology needed to build a nuclear warhead small enough to mount on a missile.
In a sign of heightened anxiety, Seoul briefly bolstered its anti-infiltration defense posture after a South Korean border guard hurled a hand grenade and opened fire at a moving object several hours before sunrise Wednesday. South Korean troops later searched the area but found no signs of infiltration, and officials believe the guard may have seen a wild animal, according to Seoul's Defense Ministry.