(CNN) -- North Korea said Monday that it would pull out all its workers and temporarily suspend operations at the industrial complex it jointly operates with the South, the latest sign of deteriorating relations on the Korean Peninsula.
The North said it would also consider permanently closing down the Kaesong Industrial Complex, a shared manufacturing zone that is the last major symbol of cooperation between the two countries.
In a statement carried by the official North Korean news agency, Kim Yang Gon, secretary of the Central Committee of the Workers' Party of Korea, accused the South of seeking "to turn the zone into a hotbed of war" against the North.
Pyongyang was already preventing South Korean workers and managers from entering the complex, which sits on the North's side of the militarily fortified border, and threatened to shut it down entirely amid its recent stream of verbal broadsides against Seoul and Washington.
The South Korean Unification Ministry wasn't immediately able to confirm whether the North had actually begun withdrawing its more than 50,000 workers from Kaesong yet.
If Pyongyang follows through on its declaration, the move could be financially costly, since Kaesong is considered to be an important source of hard currency for Kim Jong Un's isolated regime.
The ban on the entry into the zone of new workers and trucks was already putting a strain on personnel and supplies for the scores of South Korean companies operating there, prompting more than 10 of them to cease production.
A torrent of threats
North Korea has issued a catalog of alarming threats against the South and the United States in the past several weeks, sharpening its rhetoric after the U.N. Security Council imposed stricter sanctions for Pyongyang's latest underground nuclear test, which took place it February.
The strong words have put the region on edge.
Seoul said Sunday that it believed Pyongyang could conduct a missile test this week after recently moving the necessary components to the coast.
And on Monday, South Korean Unification Minister Ryoo Kihl-jae caused a brief flurry of concern when he said there were indications the North was preparing to carry out a new nuclear test.
His office later clarified that he meant that North Korea had been "continuously preparing" for another nuclear test since the February detonation, and that there hadn't been any new signs at this point.
Analysts had said at the time of the February test that the North might follow up with another detonation soon afterward as it tries to push forward its nuclear program that it says it needs as a deterrent to protect it from the United States.
A delicate situation
The North rattled the region last week by saying it would restart a shuttered nuclear reactor and by blocking South Koreans from entering the Kaesong complex.
Reports then emerged late in the week suggesting the North had loaded as many as two medium-range missiles onto mobile launchers on the east coast ahead of a possible test firing. And the South Korean president's office said Sunday it believed a missile launch could happen around Wednesday.
The North frayed nerves further by warning foreign diplomats inside the country that if war breaks out, it cannot guarantee their safety.
The string of troubling announcements from Pyongyang followed weeks of menacing rhetoric, which included the threat of a nuclear strike on South Korea and the United States.
Observers say they believe North Korea is still years away from having an operational nuclear missile, but they note it does have conventional weapons that pose a threat to countries in the region like South Korea and Japan, both of which are home to thousands of U.S. troops.
Sanctions and drills
The escalation in verbal threats from the North coincided with the tougher U.N. sanctions last month and the annual joint military exercises in South Korea by U.S. and South Korean forces, drills that have aggravated Pyongyang in previous years.
The United States initially responded to the North's invective by publicly drawing attention to its shows of military force in the training exercises, including the flight of nuclear-capable B-2 stealth bombers over South Korea.
But when those moves appeared to further infuriate rather than intimidate Pyongyang, raising worries that they increased the risk of a miscalculation in the crisis, Washington dialed back the displays of strength.
On Saturday, a senior U.S. Department of Defense official said a long-planned missile test in California, scheduled for Tuesday, was being delayed to avoid any misperceptions by North Korea.
And in a sign of the delicate situation in the region, Gen. James Thurman, the top U.S. commander in South Korea, canceled a trip to Washington this week "as a prudent measure," a U.S. military spokesman said Sunday.
Thurman was due to testify before the Senate Armed Services Committee and the House Armed Services Committee.