North Korea said on Wednesday an American man it had detained in late April, the third U.S. citizen being held by the isolated country, was intercepted because he was attempting to commit "hostile acts."

The state-run KCNA news agency said the American, identified last month as Kim Sang Dok, was arrested on April 22 at the Pyongyang airport for committing "hostile criminal acts with an aim to subvert the country."

The latest information about Kim's detention comes as tensions on the Korean peninsula run high, driven by concerns that the North might conduct its sixth nuclear test in defiance of U.S. pressure and United Nations sanctions.