"Pizza, one of the few symbols of Naples that endures... is hit by the concrete suspicion that it could be baked with wood from coffins," daily newspaper Il Giornale said.
Investigators in Naples are setting their sights on the thousands of small, lower-end pizza shops and bakeries that dot the city on suspicion that the owners may "use wood from caskets to keep ovens burning".
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Naples' graveyard has long been hunting ground for thieves: last year, 5,000 flower pots were stolen from the cemetery.
"A gang might have set up a market for coffins sold to hard-hearted owners of bakeries and pizzerias looking to save money on wood," Il Giornale said.
Wood-fired ovens
According to tradition, Neapolitan pizza should be cooked in a stone oven with an oak-wood fire.
Neapolitan pizza was invented between 1715 and 1725, with the world-famous Margherita variant first cooked up in 1889.
Tradition has it that queen Margherita of Savoy asked one of Naples' famed pizzaioli to come up with a dish for the people.
The result, which provides the basis for most pizzas enjoyed around the world, represented the colours of recently unified Italy: green basil, white mozzarella and red tomatoes.
Italy's estimated 25,000 pizzerias employ around 150,000 people and account for a turnover of 5.3 billion euros (6.5 billion dollars).
