BREAKING: North and South Korea Exchange Gunfire Along Border a day after Kim reappears

South Korea says North and South Korean troops exchanged fire along the border Sunday.

According to NBC News, South Korean military personnel fired two rounds in response after issuing a warning broadcast.

“We are in the process of taking measures to ensure that no additional situation occurs,” the joint chiefs of staff said. They added that they were communicating with North Korea through a military line, while staying prepared for further fire.

The Koreas are split along the Demilitarized Zone that was originally created as a buffer. But despite what its name suggests, the DMZ is the world’s most heavily fortified border.

Per Fox News South Korea suffered no casualties, the military said. It’s unknown whether North Korea had any casualties. The North’s official Korean Central News Agency hasn’t reported about the incident.

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.

KCNA said Kim attended Friday’s ceremony marking the completion of a fertilizer factory near Pyongyang along with senior officials. State TV showed Kim smiling and walking around factory facilities.