Nissan Motor Chairman Carlos Ghosn is suspected of directly instructing his close aide by email to make a 1.5 million dollar payment to remodel his home in Lebanon.
Tokyo prosecutors arrested Ghosn on Monday for allegedly understating his income by 5 billion yen, or about 44 million dollars, in securities reports.
Ghosn has been accused of making Nissan purchase luxury residences for him using the company's investment funds, including in Rio de Janeiro, Brazil and Beirut, Lebanon.
Informed sources say Ghosn allegedly sent an email telling an executive, who is a close aide, to arrange a payment for the Lebanon house.
Sources say about 9 million dollars was spent to purchase it and about 6 million dollars went for renovations.
Prosecutors are believed to have obtained emails between Ghosn and his close aides as part of their investigation into his suspected financial misconduct.
They allege that Ghosn gave email orders to another close aide, Nissan Representative Director Greg Kelly, to underreport his income in securities statements.
Kelly was also arrested for his involvement in the alleged financial misconduct.