This just in from MotoGP:
Further information released following fire at MotoE™ Test in Jerez
Although we are awaiting the official conclusion of the investigation by local police, initial evidence regarding the cause of the fire at the E-paddock of the FIM Enel MotoE™ World Cup at the Circuito de Jerez-Angel Nieto on March 14th seems to point to a short circuit as the main cause of the incident.
The source of the short circuit has yet to be identified but, once the fire broke out, it ignited the high-density battery which is part of the high-performance charger used at MotoE™ events.
The motorbikes were not connected to the charging infrastructure at the time the fire began.