North and South Korean troops exchanged gunfire around the South's guard post early on Sunday, May 3, raising tension a day after North Korean leader Kim Jong Un ended an almost three-week absence from public life with state media showing him visiting a factory.

North Korea South korea
Ewha University international affairs professor Leif-Eric Easley in Seoul said the shooting incident could be aimed at boosting morale in the North Korean military.Twitter

The Joint Chiefs of Staff in Seoul issued a statement saying that North Korean troops fired several bullets at a South Korean guard post inside the border zone at 7:41 am. South Korea responded by firing warning shots before issuing a warning broadcast, it said.

However, no injuries were reported in the gunbattle. South Korean defense officials said that it's unlikely for North Korea to have any casualties either as the South Korean warning shots were fired at uninhibited North Korean territory. The North's official Korean Central News Agency hasn't reported the incident.

After weeks of intense speculation about Kim's health and whereabouts, the country's official media published photographs and a report on Saturday that Kim had attended the completion of a fertiliser plant, the first report of his appearance since April 11.

South Korea has sent a message to North Korea to try to avoid an escalation, but the North hasn't immediately replied, according to South Korea's military.

The exchange of gunshots was the latest confrontation between the rival Koreas that technically remain at war.

In a lengthy briefing held later on Sunday, an official at South Korea's JCS said the gunshots did not seem a planned provocation, as the area where it occurred was farmland, but declined to provide a clear conclusion about the incident.

"In absence of vision (for the target) and in the fog, would there be an accurate provocation?" the official said.

Choi Kang, vice president of the Asan Institute for Policy Studies, said he believed the timing of the 'grey area' provocation shows it could been planned to show that Kim was still in charge of the North Korean military.

"Yesterday, Kim was trying to show he is perfectly healthy, and today, Kim is trying to mute all kinds of speculation that he may not have full control over the military," Choi said.

"Rather than going all the way by firing missiles and supervising a missile launch, Kim could be reminding us, 'yes I'm healthy and I'm still in power'."

Ewha University international affairs professor Leif-Eric Easley in Seoul said the shooting incident could be aimed at boosting morale in the North Korean military.

"The Kim regime may be looking to raise morale of its frontline troops and to regain any negotiating leverage lost during the rumor-filled weeks of the leader's absence," said Easley.

"South Korea and the United States should not take lightly such North Korean violations of existing military agreements."

Kim Jong Un appears in public

Kim was seen in photographs smiling and talking to aides at the ribbon-cutting ceremony and touring the plant. The authenticity of the photos, published on the website of the official Rodong Sinmun newspaper, could not be verified.

(With agency inputs)