Automaker Nissan on Monday accused its chairman Carlos Ghosn of “significant acts of misconduct” including underreporting his salary and said it would move to fire him, as reports emerged he faced arrest in Tokyo.

In a statement, Nissan said it had been conducting a probe into Ghosn for several months after receiving a whistleblower report and had uncovered misconduct going back several years.

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The statement came after local media reported that Ghosn was being questioned Monday night by prosecutors in Tokyo and was expected to be arrested on violation of financial regulations including misreporting his income.

The Tokyo prosecutor’s office had no comment on reports it was questioning Ghosn, who also heads an alliance of Renault, Nissan and Mitsubishi.

In its statement, Nissan said it had launched an investigation into both Ghosn and Representative Director Greg Kelly.

“The investigation showed that over many years both Ghosn and Kelly have been reporting compensation amounts in the Tokyo Stock Exchange securities report that were less than the actual amount, in order to reduce the disclosed amount of Carlos Ghosn’s compensation,” the statement said.

“Also, in regards to Ghosn, numerous other significant acts of misconduct have been uncovered, such as personal use of company assets, and Kelly’s deep involvement has also been confirmed.”

The company said it had provided information to Japanese prosecutors and would propose to the board of directors that it “promptly remove Ghosn from his positions” along with Kelly.

The astonishing news first emerged early Monday evening, when the Asahi Shimbun newspaper reported Ghosn was being questioned by prosecutors and was likely to face arrest.

Public broadcaster NHK reported that Tokyo prosecutors were raiding Nissan’s headquarters in the city of Yokohama.

Renault shares plunged 12 per cent in late-morning trading in Paris on the shock news.

“If he is arrested, it’s going to rock the Renault-Nissan-Mitsubishi alliance as he is the keystone of the alliance,” said Satoru Takada, an analyst at TIW, a Tokyo-based research and consulting firm.

“He is the man of charisma for the alliance. It is likely to have a negative impact on its brand image,” he told AFP.

Nicknamed Le Cost Killer, Brazil-born Ghosn, 64, is known for overhauling Renault and Nissan starting in the nineties.

Renault came to the rescue of the then-ailing Japanese automaker in 1999 and parachuted in Ghosn, who set about slashing costs and jobs in a huge corporate overhaul.

In 2016, Ghosn also took charge at troubled Mitsubishi after Nissan threw it a lifeline, buying a one-third stake for about $2.2 billion as it wrestled with a mileage-cheating scandal that hammered sales.

Ghosn has a high profile in Japan and is known as a major advocate of the country’s auto sector. He has not yet commented on the allegations.