Public prosecutors raided locations linked to Upper House lawmaker Akira Ishii on Wednesday over alleged fraud involving a fictitious secretary¡¯s salary.

Ishii, a 68-year-old member of Nippon Ishin no Kai, is suspected of receiving public funds by hiring a government-paid secretary who actually did not work for him, people familiar with the investigation said.

The locations searched by investigators from the Tokyo District Public Prosecutor¡¯s Office included Ishii¡¯s office in the capital.

Ishii, a native of Toride, Ibaraki Prefecture, was first elected to parliament by the now-defunct Democratic Party of Japan in the 2009 Lower House election.

Upper House lawmaker Akira Ishii
Upper House lawmaker Akira Ishii | JIJI

He is currently serving his second term in the Upper House, after first being elected to the chamber under the proportional representation system as a candidate from the then-Osaka Ishin no Kai in 2016.

Lawmakers can employ up to three secretaries on government payroll. A law was revised in 2004 to directly pay salaries to secretaries, following a series of fraud by lawmakers in the 1990s and 2000s.

Earlier this year, former Upper House lawmaker Megumi Hirose was found guilty of defrauding the government of some ?3.58 million ($24,200) by falsely claiming she had hired a government-paid secretary.