Kenyan police are investigating a retired German national who frequently visits Kenya after he was arrested last week photographing children's genitals and found to be in possession of a pornographic video featuring minors, officials said Monday. The 68-year-old man from Cologne was arrested in the Kenyan port city of Mombasa on May 17 after concerned parents told police he was taking pictures of the genitals of children swimming at a local recreation facility, they said. In the course of his arrest, authorities discovered and seized a locally made pornographic movie featuring him and adult women as well as scenes involving children, photos of naked women and Viagra tablets, they said. They added that they were investigating whether he had links to the international trade in child pornography. Authorities believe he may be part of an international syndicate that has been operating on the Kenyan coast, paying poor women to make blue movies that are later posted on the Internet. Kenyan social workers have increasingly complained that a trade in sex tourism is growing in Mombasa and nearby Indian Ocean resorts.