Multiple gunshots were fired from North Korea at 7:41am local time towards a guard post in South Korea that borders the North, the South's joint chiefs of staffs said in a statement.
North Korean troops performed artillery drills near the disputed sea boundary with South Korea at the order of leader Kim Jong Un, state media reported on Monday,
In the run-up to the New Year's Eve celebrations, security forces on social media had repeatedly warned against firing shots in the air, even specifically mentioning the danger of doing so near the airport. But images circulated on social media showed many people had ignored that advice.
Governor Dmytro Zhyvytskyy posted photographs of the charred shell of a four-story building and rescuers searching rubble. In a later Facebook post, he said many Russian soldiers and some local residents also were killed during the fighting on Sunday.