This photo, taken Oct. 14, shows a news report on North Korea's firing of artillery shots into maritime buffer zones being aired on a television at Seoul Station in central Seoul. Yonhap

North Korea's military said Wednesday it fired artillery shots overnight into maritime buffer zones near the inter-Korean border as a" warning" over South Korea's ongoing military drills.

In a statement, a spokesman for the General Staff of the Korean People's Army (KPA) said the North's military fired "warning shots" in a "strong military countermeasure" against South Korea's military exercises.

The spokesperson also called on the South to immediately stop "reckless and provocative" actions that have raised military tensions on the peninsula, according to the statement carried by the Korean Central News Agency.

It came hours after the North launched more than 250 artillery shells into waters off its east and west coast. The unnamed KPA official said the move came in response to a series of "military provocative acts by enemies," citing the Hoguk military drills under way in the South.