It said it found burn marks on a makeshift power switchboard and a 15cm (six-inch) dead animal nearby.

BBC: Fukushima: Rat linked to outage at Japan nuclear plant

The attorney general said there was little evidence of the type of burn marks typical in a bomb blast.

BBC: Mexico Pemex blast blamed on build-up of gas

The digital moving image, unblemished by scratches, hairs, burn holes or splice marks, may mesmerise techies, but purists such as Mr Spielberg believe that it robs movie-making of its artistry.

ECONOMIST: Face value