An official with deep knowledge of North Korea told CNN Tuesday there was a "strong possibility" that Kim was in Beijing after speculation began swirling late Monday about the arrival of a high-level North Korean official. Surprise visitThe unannounced visit followed a flurry of diplomacy that saw North Korea's participation in the Winter Olympics in Pyeongchang last month. A file picture of a special armored train used to transport North Korean leader Kim Jong Il. Both Kim Jong Il and Kim Il Sung, the current leader's father and grandfather respectively, traveled by heavily armored train when they visited their allies in China and Russia. The South Korean government also said it couldn't confirm whether the North Korean leader was in Beijing.

Source: CNN March 27, 2018 04:02 UTC