North Korea has denied its alleged involvement in a March cyber attack in South Korea, claiming related \"rumors\" are aimed at deepening tensions on the peninsula.Reports that North Korea is behind the March 20 hacking incident that crippled networks of some South Korean banks and broadcasters are a \"deliberate provocation,\" a spokesperson for the General Staff of the (North) Korean People\'s Army (KPA) was quoted as saying by Pyongyang\'s propaganda media on Friday.