It is sometimes extremely difficult to pinpoint an exact root cause of some incidents. Often the cause can not be positively proven, the possible causes can be speculated in most probable terms.
In some freakish incidents, only people with specific expertise and experience may have a chance to come up with plausible explanations.
This morning, in pouring rain,
there was a huge fire in a car auction yard in Sydney. More than 120 cars were destroyed in a few hours it took to put out the fire. I heard over the radio that the car battery is suspected as a cause, but I could not find any write up on the possible cause yet, only tweets.
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