German prosecutors have reportedly broadened an investigation of Audi AG's role in diesel emissions cheating with a new round of raids targeting two former Audi board members.

Two weeks after a search of Audi's headquarters in Ingolstadt, Munich prosecutors inspected the homes of three people, according to a Bloomberg report.

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The workplace of one of the people was also searched. The latest raids bring to 17 the number of people under investigation for diesel-engine rigging at Audi, part of Volkswagen AG, Bloomberg reported.

The homes of former development heads Ulrich Hackenberg and Stefan Knirsch have been raided, Wirtschaftswoche reported.

Hackenberg left the Volkswagen brand in 2015. Bloomberg said he was close to former Volkswagen Chief Executive Officer Martin Winterkorn.

Hackenberg's successor Knirsch had to step down after less than a year in post in connection with the diesel scandal.

The probe focuses on potential consumer fraud tied to Audi's role in developing diesel engines that parent Volkswagen sold in vehicles in the US as well as in Europe. 

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