New Delhi, Dec. 5 -- Italian prosecutors have asked 13 luxury fashion firms to provide documents on governance, internal controls and audits as part of an investigation into the alleged exploitation of Chinese workers at subcontractors, judicial documents showed on Thursday.

According to the documents obtained by The Associated Press, the investigation highlighted episodes of "heavy exploitations" of Chinese workers at subcontractors' workshops, where the brands involved produced some of their products.

The 13 fashion firms didn't immediately comment on the prosecutors' requests and allegations.

The fashion companies that received the orders are: Dolce & Gabbana, Versace, Prada, Adidas Italy, Missoni, Ferragamo, Givenchy Italia, Alexan...