Monday night's collision that killed Total SA CEO Christophe de Margerie and all the crew on his jet has been seen not only as a tragedy but as an embarrassment for Russia at a time of strained relations with the West.
The director general of Moscow's Vnukovo Airport and his deputy resigned today and investigators detained four more of its employees in addition to the snowplow's driver.
"The runway was clear when a traffic controller gave permission for takeoff," Morozov said, adding there was no communications between the control tower and the plane's crew after that moment.
Fourteen seconds after starting to take off in a deep fog, the plane crew saw one vehicle crossing the runway, he said.
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Then 14 more seconds later, the pilots only saw the snowplow immediately before the collision and hit it while the jet was already in the air, he said.
The airport chiefs' resignation and the four new detentions indicated that responsibility for Monday night's crash was being widened well beyond the 60-year old driver of the snowplow, Vladimir Martynenko.
Martynenko said in remarks carried by Russian television stations that he was trailing a column of other snowplows and lost his direction in the deep fog.
It wasn't immediately clear why other airport personnel had failed to track his movement. It also wasn't clear why another vehicle was driving across the runway while the plane was already in motion before takeoff.
A Moscow court today ordered Martynenko held in custody until December 21.