Mother of Guthrie McLean, 25, who has yet to be allowed to visit her son, says he is 'enduring' in captivity US embassy officials on Thursday visited the American university student detained in China over an altercation with a taxi driver, as family and friends continue to lobby for his release. Guthrie McLean, a 25-year-old student at the University of Montana, is being held at a detention centre in Zhengzhou, Henan province.