title: Russian helicopter missing off coast of Svalbard: rescue service
text: OSLO (Reuters) - The Russian helicopter that went down off the coast of Svalbard on Thursday has still not been located more than 90 minutes after it went down at sea, Norway s rescue service told independent broadcaster TV2. The helicopter had a crew of five and three passengers, all with  Russian-sounding names , said the leader of the rescue operation coordination, Tore Hongset. 