“At one point, military helicopters fired about 100 rounds at North Korean drones in the western coastal region, but failed to shoot them down,” the agency wrote.
North Korean drones crossed the border into South Korea on December 26. Seoul raised fighter jets and attack helicopters to intercept them. Later, one of the planes crashed for some unknown reason.
Four North Korean drones flew to the Ganghwa Island area and one reached Seoul.
Some time later, the “Seoul” drone returned to the DPRK, and the rest disappeared from the radar of the South Korean Air Force, Yonhap adds.