Quote:
Originally Posted by Skybird
1. Servicestaff mindlessly leaving behind a burning cigarette
2. Sabotage
3. Electric system, batteries
What option shall it be for you to bet your money on?

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I'd go with the 3rd being the most likely, although the 1st is also plausible.
There are more electrical wires running along the cabin of a commercial aircraft than most people realise. One possible hazardous area is the galley, where flight attendants have to heat up meals and water for coffee and tea. That takes a lot of wattage, which in turn creates heat and fries insulation.