Two American men have been detained, but not charged, in the ongoing investigation of the death of an Irish student, officials said Sunday. Nicola Furlong, 21, an exchange student in Tokyo, was found dead in her hotel room along with one of the men who was detained, Tokyo police said. The men, ages 19 and 23, were arrested on suspicion of making inappropriate physical contact with one of Furlong’s friends during a taxi ride Thursday. Furlong and her friend are thought to have met the two American men during a concert in the Japanese city. Tokyo police said the cause of death is thought to be suffocation as the result of cervical compression.