The Tokyo District Public Prosecutor's Office on April 15 arrested two sons of the president of Japan Traffic Control Technology (Nikkokan) Co., a traffic signal maintenance firm, in connection with a tax evasion case.

Yoshihide Amakado, 30, a board member of the Yokohama-based company, and his brother Hidehiro, 27, an official of affiliate Kowa Electronics Engineering Co., were arrested on suspicion of evading corporate taxes.

The Nikkokan group firms are suspected of evading corporate taxes amounting to 973 million yen, and the total number of people arrested in the case now stands at 15. Nikkokan President Taiyo Amakado, 61, was arrested Monday.

According to investigators, Yoshihide and Hidehiro are suspected of hiding corporate income of about 2.69 billion yen for the period between October 1992 and March 1997, in conspiracy with their father and executives of six Nikkokan group companies. They are also suspects in the 973 million yen corporate tax evasion case.