Satellite spies `` vehicle activity '' at a ballistic missile site , South Korea officials say . South Korean Foreign Ministry blasts the Democratic People 's Republic of Korea 's as `` hypocrites '' South Korea test-fires sixth short-range missile this week , North Korean source says . ` There is a limit to our patience , '' the Foreign Ministry said in a combative statement . Joint forces in South Korea elevate surveillance alert in response to North 's threat .
Satellite spies `` vehicle activity '' at a ballistic missile site , South Korea officials say . South Korean Foreign Ministry blasts the Democratic People 's Republic of Korea 's as `` hypocrites '' South Korea test-fires sixth short-range missile this week , North Korean source says . Joint forces in South Korea elevate surveillance alert in response to North 's threat .