A special train presumed to be carrying a top North Korean official left the Beijing railway station on Tuesday, wrapping up a visit shrouded in secrecy.

It is known that the train left for Shenyang en route to North Korea after a heavily guarded departure ceremony at the station. 

The North Korean official reportedly met with top Chinese officials at the Great Hall of the People and had a dinner there Monday after arriving at Beijing station early in the day. 

The official is also believed to have toured the Chinese capital on Tuesday before ending the two-day visit.

The special train that was taken by the official was previously used by former North Korean leader Kim Jong-il when he traveled to China, fanning speculations that the unidentified official was current leader Kim Jong-un. 

Some media outlets suspect Kim’s sister Kim Yo-jong or the North's nominal head of state Kim Yong-nam could have visited China as Kim Jong-un’s special envoy. 

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