PAJU, South Korea (AP) -- In past deadly confrontations between North and South Korea, a jointly operated industrial park stayed open, churning out goods.

But in the latest sign that North Korea's warlike stance toward South Korea and the United States is moving from words to action, the North on Wednesday barred South Korean managers and trucks delivering supplies from crossing the border to enter the Kaesong industrial park.

It's an announcement that further escalates a torrent of actions that analysts say is aimed at pressuring the U.S. and South Korea to change their policies toward North Korea.

The Kaesong move came a day after the North said it would restart its long-shuttered plutonium reactor and a uranium enrichment plant.