An American was detained for trespassing on the border of the Democratic People's Republic of Korea (DPRK) with China on Monday, the official KCNA news said on Thursday.

The American was under investigation, the report said, without disclosing his name.

Another American who illegally entered the DPRK in December last year was still under detention. Their crossing comes just months after the DPRK freed two U.S. journalists who had been arrested in March and sentenced to 12 years of hard labor for trespassing and "hostile acts." Former U.S. President Bill Clinton visited Pyongyang in August to take them home.