Seoul, South Korea (CNN) -- North Korean and South Korean military units exchanged gunfire near their border Friday, the South Korean Yonhap news agency reported.
The exchange happened after North Korean forces fired two shots at a South Korean military guard post near the border in Hwacheon, South Korea, about 73 miles (118 km) northeast of Seoul, Yonhap reported, citing an official at the Joint Chiefs of Staff.
The South Korean troops fired back, Yonhap said.