South Korea plans to investigate North Korean incursions across the Military Demarcation Line (MDL) in order to formally declare them violations of the Korean War armistice, Seoul’s Defense Ministry said Wednesday, following the Sept. 21 mine explosion that injured three ROK soldiers.

The ministry outlined the plan in a document submitted to the National Assembly’s Defense Committee for its annual parliamentary audit.

Seoul said it would carry out a joint investigation with the U.N. Command (UNC) to formally determine whether other suspected MDL incursions constitute armistice violations and notify Pyongyang, urging it to “halt the violations and restore the