French PM Manuel Valls confirmed on Friday that the preliminary investigations into the Germanwings plane crash indicate that “crazy, imcomprehensible” doings of the co-pilot caused the tragedy, Efe news agency reported. In an interview with French channel. i-Tele, Valls said it was necessary to wait until the end of the investigation, but that the prosecutor provided sufficient information on Thursday to suggest that the “crazy, incomprehensible, horrific act” of the co-pilot was the reason behind the plane's crash.