North Korea has detained for more than three weeks an 85-year-old American retiree who was on an organized tour due to an "misunderstanding," friends and relatives said. Merrill Newman's son Jeff said "we haven't heard anything" about the reasons for the October 26 detention. "We worked through the State Department from the day that he was supposed to depart... That started the diplomatic wheels turning, but we've heard nothing," the younger Newman told CNN television. "This is a misunderstanding. My father is a (Korean War) veteran, and wanted to see the country and culture he has been interested in for years." The elder Newman, who usually lives in a California retirement home, "arranged this with a travel agent that was recommended and said was approved by the North Korean government for travel of foreigners," his son insisted. "He had all the proper visas." Media reports suggested that Newman had traveled to North Korea with a friend from Channing House, a retirement home in Palo Alto, outside San Francisco. His traveling companion, named as Bob Hamrdla, also called his friend's detention "a terrible misunderstanding." "I hope that the North Koreans see this as a humanitarian matter and allow him to return to his family as soon as possible," said Hamrdla, in a statement cited by the San Jose Mercury News newspaper. A woman who answered the phone at Channing House declined to comment on the statement, reported to have been issued by the retirement home. But the San Jose newspaper cited a fellow resident, Bill Blankenburg, as saying that Newman's detention had been the talk of the retirement home for weeks. "We're all distressed, and we feel very strongly in support" of Newman's wife, Blankenburg said. "I don't think anyone has an idea of what's going on in the minds of the North Koreans." Newman's son, asked why the elderly man would travel to isolated North Korea, with which the United States has no relations, said it was a veteran's dream, calling his father a "curious cat." "Just like World War II vets who have had an interest in going back to Normandy, my dad wanted to go back to the northern part of the peninsula," Jeff Newman said. "He had been to the southern part of the peninsula before and this was a life-long dream of his." The State Department earlier said it was aware of reports of an American having been detained in North Korea, but declined to comment, citing privacy concerns. On Tuesday, the agency issued an updated travel advisory, urging Americans to avoid North Korea, which reportedly was "arbitrarily detaining US citizens and not allowing them to depart the country." The reclusive North is also holding US national Kenneth Bae, a 45-year-old tour operator arrested a year ago as he entered the northeastern port city of Rason. He was sentenced to 15 years' hard labor on charges of seeking to topple the government. The court described Bae, also known by his Korean name Pae Jun-Ho, as a militant Christian evangelist who smuggled inflammatory material into the country and sought to establish a subversive base in Rason. North Korea has in the past freed detained Americans after visits from high-level emissaries.