From what I have seen, my UNINFORMED guess, there was something in the refrigerator that leaked an explosive gas, which was then ignited by the compressor contacts (or anything that generated an arc), ice maker for example.
I have not had a chance to research this, but I suspect there are items that have flammable propellants that might be found in the refrigerator and a small leak could allow the gases to accumulate until an explosive level was reached.
It appears also that the flammable coolants are used in Europe, not in the USA, and I believe the Whirlpool units use R134a, which is NOT flammable.
Hopefully, there will be a follow-up report from the fire marshal that will detail what happened.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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