KTVU 2 reports that fire crews initially extinguished the blaze in a couple of minutes but it then reignited multiple times over the next week.
"If the high voltage battery catches fire, is exposed to high heat, or is bent, twisted, cracked, or breached in any way, use large amounts of water to cool the battery".
The witness said he tried to help the teenagers but the fire was too intense to get them out of the auto.
In the event of an accident, eight airbags protect front and rear occupants, and the battery system automatically disconnects from the main power source, Tesla has said previously in promotional materials for the vehicle.
The agency said it booted Tesla out of a group investigating the crash after the company prematurely made investigation details public.
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The National Transportation Safety Board is investigating a Tesla crash in Florida this week that killed two high school students - the second fatal accident involving a Tesla in the past six weeks.
"Our thoughts are with the families and friends affected by this tragedy", the company said.
Tesla, based south of San Francisco in Palo Alto, California, did not respond to an immediate request, however issued a statement that it had so far not been able to retrieve a vehicle identification number which would allow the company to access the car's computer logs.
"In addition, the NTSB is now investigating a fire involving the transportation of hydrogen gas for fuel cell vehicles". That vehicle was in Autopilot mode when it hit a concrete barrier.
In 2013, the Model S received a safety rating from the National Highway Traffic Safety Administration (NHTSA) that was higher than any vehicle the agency had previously tested. Local authorities believe that that speeding might have been the cause. The pioneering electric vehicle firm is spearheaded by Elon Musk, the founder of US -based rocket company Space X.
He said the agency was investigating because there was a post-crash fire involving an electric vehicle. In a he said/she said case, it was reported April 12 that the NTSB had revoked Tesla as a party to the investigation because the carmaker released "investigative information before it was vetted and confirmed by the NTSB".