Total boss death: 'Criminal negligence' behind Moscow plane crash

Russian investigators have said "criminal negligence" caused the crash at a Moscow airport that resulted in the death of Total's chief executive.

Christophe de Margerie died along with three crew members when his corporate jet collided with a snow plough.

Federal investigators said the driver of the snow plough was drunk, and managers at the airport "negligent".

Lucy Williamson reports from Paris.