A North Korean national has gained entry to the American embassy in Vientiane and a second failed and was arrested by Lao police, US-funded Radio Free Asia said Wednesday. "Two male adults tried to climb over the fence of the US embassy," an RFA journalist based in Bangkok told AFP, adding that the incident took place Tuesday morning. "One managed to get in and the other one was arrested by Lao police and taken to (a) police station," he added, quoting a Lao police officer speaking on condition of anonymity. Lao foreign ministry spokesman Yong Chanthalangsy said he could not confirm the report. An official at the US embassy in Vientiane refused to comment directly on the report, which if true could lead to the first successful attempt by a North Korean to seek political asylum in communist Laos. "The United States have always been concerned by the suffering of the North Korean people including those who have fled to other countries," said the unnamed official. Two North Koreans entered Sweden's embassy in Hanoi last December just day after four had gained entry to the French mission in the same city.