North Korea has expelled hundreds of South Korean workers from a jointly-run industrial park in response to Seoul's decision to suspend operations at the complex over Pyongyang's recent rocket launch.

Pyongyang ordered a military takeover of the Kaesong zone on Thursday, freezing South Korean assets and pulling out tens of thousands of North Korean employees.

Seoul said its decision to suspend operations at Kaesong was an effort to stop North Korea from using hard currency earned from the park to pay for its nuclear and missile programmes.

South Korea suspends joint project with North Korea

North Korea tested what it said was a hydrogen bomb on January 6 and on Sunday launched a rocket, putting a satellite into orbit.

The United States, Japan and South Korea said Sunday's launch was a ballistic missile test, and like last month's nuclear test, a violation of UN resolutions.

"I feel horrible. If it stops operating, companies like ours have to close business. It's difficult," said Yoon Sang-Eun, a driver, heading to South Korea.

"I feel sorry for the North Koreans, because they are way more worried than we are," said another worker of the complex, Kim Soo-Hee, a nurse.

Al Jazeera's Harry Fawcett, reporting from the inter-Korean border, said that the response from North Korea on Thursday was expected but still came as a surprise as Pyongyang gave Seoul only half an hour to move the workers out of the complex with only personal belongings.

Kaesong's profitable arrangement

The factory park, which started producing goods in 2004, has provided $560M in cash to North Korea, South Korean Unification Minister Hong Yong-pyo said.

Combining South Korean initiative, capital and technology with the North's cheap labour, the industrial park has been seen as a test case for reunification between the Koreas. Last year, 124 South Korean companies hired 54,000 North Korean workers to produce socks, wristwatches and other goods worth about $500M.

South Korean businesses with factories at the park reacted with a mixture of disappointment and anger. In a statement, the association of South Korean companies at Kaesong denounced Seoul's decision as "entirely incomprehensible and unjust".

The park also allowed people from both Koreas to interact with each other and glimpse into lives on the other side of the border.

United Nations condemns Pyongyang for rocket launch

Source: Al Jazeera and agencies