Toshiba Corp. President Hisao Tanaka and two other executives quit to take responsibility for a $1.2 billion accounting scandal that caused the maker of nuclear reactors and household appliances to restate earnings for more than six years.

Norio Sasaki, the vice chairman, and Atsutoshi Nishida, a former president who was serving as adviser, also resigned, the Tokyo-based company said Tuesday, more than two months after announcing it was investigating possible accounting irregularities. The company said earlier in the day it would correct earnings by at least 152 billion yen, based on the results of a third-party investigation of its books.

"For the company to rebuild there needs to be a renewal of the management structure," Tanaka, a 42-year veteran, said during a briefing Tuesday in which he, Chairman Masashi Muromachi and Vice President Keizo Maeda all bowed in apology.

Muromachi will take over as interim president, and Toshiba will announce a new management team in mid-August. No charges have been filed against Toshiba or its executives in the case.

The resignations come after a report showed that top executives set unrealistic profit targets that systematically led to flawed accounting. The accounting irregularities were "skillfully" hidden from outside observers, according to the investigation.

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Toshiba, a 140-year-old pillar of Japan Inc., is caught up in the country's biggest accounting scandal since 2011. Tanaka and Sasaki, who between them have led the company for the past six years, sought to delay booking losses, and employees were unable to go against management orders, according to the report.

Japan Exchange Group, which runs the Tokyo Stock Exchange, will examine whether Toshiba's internal management systems need improvement, and if a strong need is seen, the company could be designated a "security on alert," a spokeswoman, Miwa Aonuma, said by phone.