Officials say they have detained five members of a "banned international terrorist organisation" in the North Caucasus region of Russia. The arrests were made in the town of Nalchik, some 185 miles east of Sochi, the site of next month's Winter Olympics.The five suspects were in possession of "grenades, ammunition, and a homemade explosive device packed with shrapnel", the National Anti-Terrorism Committee said. The authorities did not provide further information on the terror organisation to which the men were alleged to belong.