North and South Korea exchange fire over propaganda balloons from South Korean activists

According to Yonhap news, North and South Korea recently exchanged fire on land on October 10. 

Apparently, a group of South Korean activists prepared and sent ten balloons filled with 200,000 propagandistic leaflets, 400 DVDs, 300 books about South Korea, and $1,000 over the border in hopes of reeducating North Koreans during the 69th anniversary of North Korean ruling party, Workers' Party.  However, the South Koreans' plan failed as North Korea attacked the balloons and some shots landed on South Korean soil, inciting retaliation. 

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Shots, apparently from anti-aircraft machine guns, were heard around 3:55 PM and discovered in South Korea at 4:50 PM.  South Korea gave a warning at 5:30 PM, then returned fire ten minutes later.  In addition, Seoul military officials denied the use of artillery. There are no reported casualties as of yet.  

Meanwhile, there has been a lot of curiosity about the missing-in-action leader, Kim Jong Un, who has remained unseen for more than month, causing speculations that leadership has temporarily fallen onto his sister during his absence.  Allegedly, he is unavailable due to a physical ailment, yet not much more information has been provided.