have there been any documented cases

I don't know of any disasters, but the warning is well taken.
In Finland, for example, WAP tests from oil companies at service stations have been suspended, because of the risks of using cell phones on forecourts. As said elsewhere, it's not heat that may ignite the vapour mixture, but merely energizing the mixture.

Henno
# 00120
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Henno mk2 [orange]6 [/orange]nr 6