North Korea is looking for a venue in Switzerland for a possible second summit between its leader Kim Jong Un and U.S. President Donald Trump, diplomatic sources said Thursday.

The sources said North Korean diplomats have been sent to Bern, Davos and Geneva to obtain firsthand information about international conference halls and hotels that could be used for a bilateral summit and talks involving China and South Korea.

Kim studied at a junior high school in Bern. Geneva was considered a major candidate city for the first-ever North Korea-U.S. summit, which took place in Singapore on June 12.

Davos is the venue of the annual World Economic Forum. North Korea may be looking at the possibility of holding a summit with the United States and other talks when the next World Economic Forum is held in January.

At the June 12 summit, Kim committed to the "complete" denuclearization of the Korean Peninsula while Trump promised to provide security guarantees to Pyongyang.