The French government has deployed three investigators and two technical consultants from its aviation authority to also investigate the crash . NEW : Judge orders snowplow drivers involved in accident to be placed in pretrial detention . Director general of the airport and his deputy resign from their posts . Three other people are detained over a crash that killed the head of a French oil firm . Total : Christophe de Jong and three others were killed in the crash in France .
NEW : Judge orders snowplow drivers involved in accident to be placed in pretrial detention . Director general of the airport and his deputy resign from their posts . Three other people are detained over a crash that killed the head of a French oil firm . Total : Christophe de Jong and three others were killed in the crash in France .