NEW : Judge orders snowplow driver involved in crash to be held in pretrial detention . Director general of the airport and his deputy resign from their posts . Four other people are detained over a crash that killed the head of a French oil firm . Score: 6
NEW : Judge orders snowplow driver involved in crash to be held in pretrial detention . Director general of the airport and his deputy resign from their posts . Four other people are detained over a crash that killed the head of a French oil firm . Total CEO Christophe de Margerie and three others were killed in the crash in Moscow .