SKorea media says North Korea firing on South Korean propaganda loudspeakers on border

A man locks a shutter of his shop after an evacuation order is issued to the residents and visitors at the Imjingak Pavilion near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Thursday, Aug. 20, 2015. South Korea's military fired dozens of shells Thursday at rival North Korea after the North lobbed a single artillery round at a South Korean border town, the South's Defense ministry said. (Kim Seung-doo/Yonhap via AP) KOREA OUT (The Associated Press)

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People watch a television news program reporting about South Korea's respond to the North with a file video footage at Seoul train station in Seoul, South Korea, Thursday, Aug. 20, 2015. South Korea's military fired dozens of shells Thursday at rival North Korea after the North lobbed a single artillery round at a South Korean border town, the South's Defense ministry said. The letters read "South Korean military, respond 155mm shells to the North." (Kim Do-hun/Yonhap via AP) KOREA OUT (The Associated Press)

A South Korean soldier uses a radio on a military vehicle at the South Korean border town of Yeoncheon, South Korea, Thursday, Aug. 20, 2015. South Korea's military fired dozens of shells Thursday at rival North Korea after the North lobbed a single artillery round at the border town, the South's Defense ministry said. (Hong Hae-in/Yonhap via AP) KOREA OUT (The Associated Press)

SEOUL, South Korea – South Korea's Defense Ministry says surveillance equipment has detected the trajectories of suspected North Korean rockets and is investigating whether the North has fired at South Korea.

The South said in the statement Thursday it wasn't clear if the North had fired on the border between the rivals, where loudspeakers have been broadcasting anti-Pyongyang propaganda over the past week.

The North had previously said it would retaliate for the South Korean broadcasts critical of alleged North Korean provocations and trumpeting South Korea's democratic system. Seoul started the broadcasts recently in response to what it said were North Korean laid land mines that maimed two South Korean soldiers.