I am not saying this was the case, but it happened to me years ago at ORY. A similar runway layout. An Indian B747 freighter (I think) started to roll as I was short finals. The cause was a wrong change of frequency from ground to departure. They checked in on departure, who without confirmation of position, cleared them to an intermediate FL. So off they went rumbling down the runway. The human links in the chain are guaranteed at some point to prove weaker than required.