A Russian aircraft belonging to Russia's state oil company Rosneft crashed in Russia's Krasnoyarsk region in Siberia on Thursday, killing 10 people on board, regional transport prosecutors said on their website www.zsproc.ru.
"Causes of the incident are being investigated," Rosneft said in the statement. The helicopter was carrying workers to an oil production site at Vankor, an oilfield belonging to Rosneft.
The aircraft was a civilian Mi-8 helicopter with a total of 26 people on board, including four crew members, spokesperson for the West Siberian Transport Prosecutor's Office Oksana Gorbunova told Interfax.
Krasnoyarsk is the third largest city in the Siberian region, with a population of over 1 million people, according to a 2010 census.