The extraordinary row at Renault, which began last March over leaked information regarding the company’s electric vehicle plans, rumbles on.

A French investigating magistrate has conducted a search of Renault’s Paris HQ as part of a probe into the fraud case, the company confirmed.

The judge, Herve Robert, accompanied by law enforcement officers, searched the offices of senior executives, including that of the personal assistant of chief executive Carlos Ghosn, on Wednesday.

The investigation is trying to determine responsibility in the case involving members of Renault’s internal security service who tried to defraud the company through an elaborate scheme in which three senior executives were wrongly accused of having leaked information about the company’s EV plans.

The three executives were fired but the company has since compensated them when the fraud attempt was uncovered.

The affair shook Renault internally and tarnished the company’s image, provoking the resignation of chief operating officer Patrick Pelata and a far-reaching revamp of the company’s governance.