North Korea Blocks South Korean Workers From Entering Factory

North Korean authorities today banned South Korean workers from entering the Kaesong Industrial Zone, an inter-Korean project just above the border.  
The move was widely expected as Pyongyang has slowly ratcheted up tensions with a series of threats in the past few months, putting the South Korean government on edge over the safety of more than 800 workers still inside North Korea.  
"We should stop this from going into the worst-case scenario," South Korean Defense Minister Kim Kwan-Jin said at a meeting of ruling party lawmakers. "But in case of crisis, we consider all options, including military actions".