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They included top Italian brands and supermarket own-brands, and many were produced by Petti.

But 17 appeared to contain Chinese tomatoes, 10 of which are made by Petti - the Italian company we found listed repeatedly in international shipping records.

In 2021, one of the Petti group’s factories was raided by the Italian military police on suspicion of fraud - it was reported by the Italian press that Chinese and other foreign tomatoes were passed off as Italian.

As part of our investigation into Petti, a BBC undercover reporter posed as a businessman wanting to place a large order with the firm.

In its response to our investigation, the Petti group told us it had not bought from Xinjiang Guannong since that company was sanctioned by the US for using forced labour in 2020, but did say that it had regularly purchased tomato paste from a Chinese company called Bazhou Red Fruit.