Train Fueling Speculation News Today

Train fueling speculation that north korean leader kim jong-un was visiting china. andrew stevens is live in beijing with more. what have you learned, andrew? >> reporter: its intriguing story, alisyn. as you say, an armored train appearing in beijing. a cloak of secrecy descending on the occupants. we do know the train left a little bit more than 24 hours later. everything does, though, point to the fact that it is kim jong-un. no official line on that. a cnn source, someone with deep knowledge...