(LEAD) N. Korea threatens to apply 'wartime laws' on detained U.S. national By Sam Kim SEOUL, June 24 (Yonhap) -- North Korea threatened Thursday to apply "wartime laws" on a U.S. national it is holding, citing what it called U.S. hostilities against the communist country over the sinking of a South Korean warship. Earlier this year, a North Korean court sentenced Aijalon Gomes, a 30-year-old American, to eight years in a labor camp for illegal entry on Jan. 25. The communist state's official Korean Central News Agency said its authorities are considering additional measures against Gomes "from the perspective of...