TOKYO - Billionaire Japanese developer Yoshiaki Tsutsumi, once listed by Forbes as the world's richest man, was arrested Thursday over allegations of insider trading and falsifying financial statements at his company. Tsutsumi, 70, owns a major stake in Kokudo Corp., which controls Seibu Railway and its 85 subsidiaries. He also owns Prince Hotels Inc., the Seibu Lions professional baseball team and Seibu Construction Ltd. He was arrested on suspicion of violating the securities and exchange law, the Tokyo District Prosecutors' Office said. Prosecutors took Tsutsumi to a Tokyo detention center for questioning. Prosecutors also raided Seibu Railway's offices to gather...