The investigation will consider all possible causes for the Sunday evening crash of a Boeing 737 in Kazan, first deputy head of the Tatarstan department of the Investigative Committee Marat Zaripov has told the press.
"All possible causes will be considered - weather conditions, piloting error, technical defects of the aircraft, fuel problems and also terrorism," he said.
He said instructions were given to take samples of the aircraft's fuel. "We know that the airliner was refueled in Moscow," Zaripov said.
"Corresponding studies will be ordered after the examination of the crash scene. Documents have been retrieved," he added.
The flight recorders have not yet been discovered and without them it is hard to say anything about the causes for the crash, Zaripov said. He said that a criminal inquiry into the crash of the aircraft was launched and witnesses are being questioned.
Citing witness accounts he said that the airliner failed to make a landing during its first attempt, circled around, touched the ground with its wing 150-160 meters away from the runway and exploded. "The area covered by fragments of the airliner is quite large - 500 by 500 meters. The investigation continues," he said.
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