North Korea on Wednesday fired more than 100 artillery rounds from its east coast into the military buffer zone established by the military agreement with South Korea.
This was announced by the South Korean military, Yonhap news agency reports.
The shelling is a violation of a 2018 agreement not to conduct such actions in the area, South Korea's Joint Chiefs of Staff said.
The shelling came after North Korea fired a barrage of ballistic missiles, including one that flew over the maritime border with South Korea. The agency also specified that the North Korean military launched at least 17 short-range ballistic missiles and surface-to-air missiles on November 2.
South Korean President Yoon Suk-yeol called the launch a territorial violation. Seoul responded to Pyongyang's actions by launching three surface-to-air missiles into international waters on the North Korean side of the maritime border.
The launches came about a day after Pyongyang threatened to take "strong measures" if the US did not end military exercises with partners including South Korea. This was perceived as a veiled threat to use nuclear weapons.