North and South Korean troops reportedly exchanged fire along their tense border today. The Joint Chief of Staff in Seoul said that North Korean troops fired several bullets at a South Korean guard post inside the border zone. It said, South Korea responded with two rounds after issuing a warning broadcast.<br />'' <br />'' Observers say, it is the first such incident since the rivals took unprecedented steps to lower front-line animosities in late 2018.<br />'' South Korea suffered no casualties, the military said. The North's official Korean Central News Agency hasn't reported about the incident.<br />'' <br />'' South Korea said, it was trying to contact North Korea via a military hotline to avoid an escalation.<br />'' <br />'' It comes a day after North Korea broadcast images of leader Kim Jong Un reappearing in public after a 20-day absence amid intense speculation about his health.<br />''  <br />