MOSCOW, December 16 (RAPSI) – Moscow’s Basmanny District Court on Tuesday extended the house arrest of two Vnukovo airport employees charged in the criminal case over Total CEO Cristophe de Margerie’s death, RAPSI reports from the courtroom.

Flight supervisor Roman Dunaev will remain under house arrest until April 22. The house arrest of air traffic control trainee Svetlana Krivsun was extended until April 23. The defendants asked to release them on bail or impose travel restrictions on them.

The investigation into the case was extended until May 21, 2015.

Total CEO Christophe de Margerie died in the crash of his Falcon 50 private jet on the evening of October 20 at Vnukovo Airport along with three crew members, all French citizens. The plane, which was scheduled to depart to Paris, hit a snow removal vehicle during takeoff.

Russian authorities have detained until December 21 airport engineer Vladimir Ledenev, snowplow driver Vladimir Martynenko and air traffic controller Alexander Kruglov. Air traffic control trainee Svetlana Krivsun and flight supervisor Roman Dunaev were placed under house arrest.

The employees of the airport stand accused of violation of air traffic rules which resulted in death of two and more people. They face up to seven years in prison each.

All defendants have pleaded not guilty to the charges brought against them.