North Korean leader Kim Jong Un is reportedly in China on an unannounced visit, Bloomberg News reported Monday, citing three unnamed sources.
There was no official statement on the report, which was not covered by Chinese or North Korean state media. If Kim is in China, it would be his first foreign trip since taking power in 2011.
It would also mark a significant diplomatic development ahead of a potential meeting between Kim and U.S. President Donald Trump.
Footage from Japanese TV showed an old-style green train at a Beijing train station similar to the one used by Kim's father, Kim Jong Il.
Journalists in Beijing also reported seeing a military honor guard welcoming a convoy of vehicles arriving at the Diaoyutai State Guesthouse, where top North Korean officials have stayed during a visit to China.
There were also reports of heavy security along Beijing's main east-west thoroughfare, Changan Avenue. Police also cleared all tourists out of Tiananmen Square, which usually only happens when Chinese leaders are meeting with visiting heads of state in the Great Hall of the People.