A train reported to be carrying a high-level North Korean delegation departed from the Chinese capital on Tuesday afternoon, multiple media have reported.

No details about the make-up of the delegation – or even acknowledgment that it exists – have been released by either Chinese or DPRK state media.

But Monday saw reports emerge that an olive-green train, similar to the one used by DPRK leader Kim Jong Il on past visits to China, had arrived in Beijing under heavy security.

The news, first broken by Japan’s Nippon TV, sparked a flurry of speculation that Kim Jong Un was onboard