South Korea fired warning shots after, Seoul says, North Korean troops crossed their border. The soldiers then went back to the North, Seoul said.

Observers claimed the Pyongyang troops might have mistakenly crossed the boundary while fortifying their side with anti-tank barriers or mines.

In an unexpected border intrusion, about 10 North Korean soldiers crossed the tense border between North and South Korea, prompting the South to fire warning shots. This marks the first known intrusion by North Korea in nearly a year.