(LONDON) -- There is still no word as to what caused Friday's fire on a Boeing 787 Dreamliner at London's Heathrow Airport, but British Aviation officials say that it was not linked to battery problems which had previously grounded the Dreamliners.
Officials told ABC News that there is "no evidence of a direct causal relationship" between Friday's fire and the previous battery issues.
A fire onboard an Ethiopian Airlines Boeing 787 Dreamliner shut down runways at London's Heathrow Airport on Friday. There were no passengers on board the plane at the time of the fire.
In a statement, the U.K.'s Air Accidents Investigation Branch made clear that the investigation is expected to take several days. Based on initial evidence, officials say that the upper portion of the rear fuselage of the plane suffered extensive heat damage.
"However, it is clear that this heat damage is remote from the area in which the aircraft main and Auxiliary Power Unity batteries are located," says the Air Accidents Investigation Branch's statement.
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