South Korea sent two helicopters to battle a wildfire inside the Korean Demilitarized Zone (DMZ), Seoul’s military said Friday, adding it had warned North Korea in advance of its firefighting mission along the heavily armed border area.

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

South Korea's military fired warning shots on Monday after approximately 10 North Korean soldiers crossed the heavily fortified border separating the two countries, officials said. According to the South's Joint Chiefs of Staff,