Iran is under mounting pressure to reveal the whereabouts of two of the nation's HIV researchers, who have been detained without charge since late June.The brothers, Arash and Kamiar Alaei, have achieved international acclaim for their progressive HIV-prevention programme and were scheduled to speak about it at the 17th International AIDS Conference in Mexico City last month. Both were arrested before leaving the country. The men had collaborated with other scientists around the world, including some in the United States, and are not thought to have been politically active.
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