An armoured train has arrived in Beijing from North Korea, and Kim Jong-un might be on board.
If true, it would be the first time he's left his country since taking office in 2011.
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Distinctive green and yellow markings on the train prompted speculation on Chinese social media that the reclusive leader had left his military state. Japanese media reports the train had 21 cars - a sign that a VIP passenger was on board.
Kim Jong-il, the current dictator's father, took an identical train to Beijing in 2011, which was the last time North and South Korea held a formal summit. His trip was not acknowledged until after he returned home.
Once it arrived in Beijing, the train seemed to be welcomed by an honour guard.
There was a heavy police presence at a guest house in Beijing often frequented by foreign leaders, and roads were closed and cordoned off in the area. Tourists were cleared out of Tiananmen Square, a signal that an important meeting was to take place.
Negotiations are currently underway for possible talks between North and South Korea, as well as the United States.