Russian Investigative Committee spokesperson Svetlana Petrenko announced that a criminal case would be opened following the deadly helicopter crash in Siberia's Krasnoyarsk region, in a statement recorded in Moscow on Saturday. Petrenko added that the investigation examines «all the possible versions of the incident, including the pilot's error.» Investigators seized flight documentation and... Еще samples of fuel. The committee has also interviewed staff who serviced the helicopter, airline employees and eyewitnesses. Training and the awarding of pilot licences will be examined. The Mi-8 helicopter crashed shortly after take-off at 10am local time (03:00 GMT) about 180 kilometres (112 miles) from the town of Igarka. None of the 15 passengers and 3 crew members on board the Utair airlines flight survived. Rosneft, who chartered the helicopter heading towards the Vankor oil- and gas-field, believe human error was responsible.