A special train possibly belonging to the North Korean ruler, Kim Jong-un, has been spotted at a resort town, according to satellite images reviewed by a Washington-based North Korea monitoring project, amid conflicting reports about Kim’s health and whereabouts.The monitoring project, 38 North, said in its report on Saturday that the train was parked at the “leadership station” in Wonsan on 21 April and 23 April. The station is reserved for the use of the Kim family, it said.Though the group said it was probably Kim’s train, Reuters has not been able to confirm that independently, or whether he was in Wonsan.“The train’s presence does not prove the whereabouts of the North Korean leader or indicate anything about his health but it does lend weight to reports that Kim is staying at an elite area on the country’s eastern coast,” the report said.Speculation about Kim’s health first arose due to his absence from the anniversary of the birthday of North Korea’s founding father and Kim’s grandfather, Kim Il-sung, on April 15.On Saturday, Kim missed another national holiday, North Korea’s Military Foundation Day, further fuelling speculation about his health.According to a report in Newsweek, US intelligence has seen no sign of unusual military activity in the reclusive regime but are continuing to monitor the situation closely.Newsweek quoted a senior unnamed Pentagon official as saying: “We have observed no indications or received any additional information to make a conclusive assessment on the status of North Korean leadership or health of Kim Jong-un.”But the official went on to say the presence of the train in Wonsan and Kim’s absence from recent events leant credibility to reports of his ill-health. Kim’s status meant North Korea could conceivably delay announcing his death to ensure security measures were in place, the official said.North Korea’s state media last reported on Kim’s whereabouts when he presided over a meeting on 11 April.