A train that may have carried North Korean dictator Kim Jung Un was spotted in Beijing on Monday. It returned to North Korea on Tuesday.
If Kim was on board the train, it was the first visit by North Korea's leader since former dictator Kim Jong Il visited in May 2011 and the younger Kim's first since taking over the leadership of North Korea following his father's death.
North Korea and China had been negotiating a visit for a while, but China had insisted that North Korea take steps toward denuclearization before any such visit.