Heavily armed police guard an area outside a train station ahead of the arrival of a convoy in Beijing, China, Tuesday, March 27, 2018. The activity followed the arrival Monday of a train resembling one used by North Korea's previous leader, and a foreign guesthouse in Beijing had a heavy security presence overnight. Some media have speculated that North Korean leader Kim Jong-un was making a surprise visit to China. (AP Photo/Ng Han Guan)
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