A South Korean vehicle carrying boxes, returning from the North Korean city of Kaesong arrives at the customs, immigration and quarantine office near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, April 9, 2013. North Korean workers didn't show up for work at the Kaesong industrial complex, a jointly run factory with South Korea on Tuesday, a day after Pyongyang suspended operations at the last remaining major economic link between rivals locked in an increasingly hostile relationship. (AP Photo/Lee Jin-man)The Associated Press
A South Korean man, center, unloads boxes transported from North Korea's Kaesong as reporters seek his comment upon arrival at the customs, immigration and quarantine office near the border village of Panmunjom, that has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, April 9, 2013. A few hundred South Korean managers, some wandering among quiet assembly lines, were all that remained Tuesday at the massive industrial park run by the rival Koreas after North Korea pulled its more than 50,000 workers from the complex. Others stuffed their cars full of goods before heading south across the Demilitarized Zone that divides the nations. (AP Photo/Lee Jin-man)The Associated Press
South Korean vehicles, returnning from the North Korean city of Kaesong, arrive at the customs, immigration and quarantine office near the border village of Panmunjom, in Paju, north of Seoul, South Korea, Tuesday, April 9, 2013. North Korean workers didn't show up for work at the Kaesong industrial complex, a jointly run factory with South Korea on Tuesday, a day after Pyongyang suspended operations at the last remaining major economic link between rivals locked in an increasingly hostile relationship. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCEThe Associated Press
South Koreans arrive with their belongings from North Korea's Kaesong at the customs, immigration and quarantine office near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, April 9, 2013. A few hundred South Korean managers, some wandering among quiet assembly lines, were all that remained Tuesday at the massive industrial park run by the rival Koreas after North Korea pulled its more than 50,000 workers from the complex. Others stuffed their cars full of goods before heading south across the Demilitarized Zone that divides the nations. (AP Photo/Lee Jin-man)The Associated Press
A South Korean businessman reacts during an emergency meeting of the Corporate Association of Kaesong Industrial Complex in Seoul, South Korea, Tuesday, April 9, 2013. The factory complex that is North Korea's last major economic link with the South was a virtual ghost town Tuesday after Pyongyang suspended its operations and recalled all 53,000 of its workers, cutting off jobs and a source of hard currency in its war of words and provocations against Seoul and Washington. (AP Photo/Choi Jae-goo, Yonhap) KOREA OUTThe Associated Press
PYONGYANG, North Korea – Scores of North Koreans of all ages planted trees as part of a forestation campaign — armed with shovels, not guns. In the evening, women in traditional dress danced in the plazas to celebrate the 20th anniversary of the late leader Kim Jong Il's appointment to a key defense post.
Despite another round of warnings from their leaders of impending nuclear war, there was no sense of panic in the capital on Tuesday.
Chu Kang Jin, a Pyongyang resident, said everything is calm in the city.
"Everyone, including me, is determined to turn out as one to fight for national reunification ... if the enemies spark a war," he added, using nationalist rhetoric common among many North Koreans when speaking to the media.
The North's latest warning, issued by its Asia-Pacific Peace Committee, urged foreign companies and tourists to leave South Korea.
"The situation on the Korean Peninsula is inching close to a thermonuclear war due to the evermore undisguised hostile actions of the United States and the South Korean puppet warmongers and their moves for a war against" North Korea, the committee said in a statement carried by state media on Tuesday.
There was no sign of an exodus of foreign companies or tourists from South Korea.
White House spokesman Jay Carney called the statement "more unhelpful rhetoric."
"It is unhelpful, it is concerning, it is provocative," he said.
The warning appeared to be an attempt to scare foreigners into pressing their governments to pressure Washington and Seoul to act to avert a conflict.
Analysts see a direct attack on Seoul as extremely unlikely, and there are no overt signs that North Korea's army is readying for war, let alone a nuclear one.
North Korea has been girding for a showdown with the U.S. and South Korea, its wartime foes, for months. The Korean War ended in 1953 with an armistice, not a peace treaty, leaving the peninsula still technically at war.
In December, North Korea launched a satellite into space on a rocket that Washington and others called a cover for a long-range missile test. The North followed that with an underground nuclear test in February, a step toward mastering the technology for mounting an atomic bomb on a missile.
Tightened U.N. sanctions that followed drew the ire of North Korea, which accused Washington and Seoul of leading the campaign against it. Annual U.S.-South Korean military drills south of the border have further incensed Pyongyang, which sees them as practice for an invasion.
Last week, North Korean leader Kim Jong Un enshrined the pursuit of nuclear weapons — which the North characterizes as a defense against the U.S. — as a national goal, along with improving the economy. North Korea also declared it would restart a mothballed nuclear complex.
Adm. Samuel Locklear, commander of U.S. Pacific Command, told the Senate Armed Services Committee in Washington on Tuesday that he concurred with an assessment by Sen. John McCain, R-Ariz., calling the tension between North Korea and the West the worst since the end of the Korean War.
"The continued advancement of the North's nuclear and missile programs, its conventional force posture, and its willingness to resort to asymmetric actions as a tool of coercive diplomacy creates an environment marked by the potential for miscalculation," Locklear told the panel.
He said the U.S. military and its allies would be ready if North Korea tries to strike.
Heightening speculation about a provocation, foreign diplomats reported last week that they had been advised by North Korea to consider evacuating by Wednesday.
However, Britain and others said they had no immediate plans to withdraw from Pyongyang.
South Korean President Park Geun-hye, who has sought to re-engage North Korea with dialogue and humanitarian aid since taking office in February, expressed exasperation Tuesday with what she called the "endless vicious cycle" of Seoul answering Pyongyang's hostile behavior with compromise, only to get more hostility.
U.S. and South Korean defense officials have said they've seen nothing to indicate that Pyongyang is preparing for a major military action.
State Department spokesman Patrick Ventrell said there was "no specific information to suggest imminent threat to U.S. citizens or facilities" in South Korea. The U.S. Embassy has neither changed its security posture nor recommended U.S. citizens take special precautions, he said.
Still, the United States and South Korea have raised their defense postures, as has Japan, which deployed PAC-3 missile interceptors in key locations around Tokyo on Tuesday as a precaution against possible North Korean ballistic missile tests.
In Rome, U.N. Secretary-General Ban Ki-moon described the tensions as "very dangerous" and said that "any small incident caused by miscalculation or misjudgment" may "create an uncontrollable situation."
Also Tuesday, citing the tension, North Korea pulled out more than 50,000 workers from the Kaesong industrial park, which combines South Korean technology and know-how with cheap North Korean labor. It was the first time that production has been shut down at the complex, the only remaining product of economic cooperation between the two countries that began about a decade ago when relations were much warmer.
Other projects from previous eras of cooperation such as reunions of families separated by war and tours to a scenic North Korean mountain have been suspended in recent years.
Though the North Korean Foreign Ministry advised foreign embassies to evacuate, tourism officials are continuing to welcome visitors.
National carrier Air Koryo's daily flight from Beijing was only half full on Tuesday. Flight attendants in red suits and blue scarves artfully kept in place by sparkling brooches betrayed no sense of fear or concern.
Tourist Mark Fahey, a biomedical engineer from Sydney, Australia, said he thought a war was "pretty unlikely."
Fahey, a second-time visitor to North Korea, said he booked his trip to Pyongyang six months ago, eager to see how the country might have changed under Kim Jong Un. He said he chose to stick with his plans, suspecting that most of the threats were rhetoric.
"I knew that when I arrived here it would probably be very different to the way it was being reported in the media," he told The Associated Press at Pyongyang airport. He said his family trusts him to make the right judgment, but "my colleagues at work think I am crazy."
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Associated Press writers Hyung-jin Kim in Seoul, South Korea, Nicole Winfield in Rome and Matthew Pennington, Donna Cassata and Richard Lardner in Washington contributed to this report.
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Follow AP's Korea bureau chief on Twitter at twitter.com/newsjean.
