The Tokyo District Court on Thursday authorized a 10-day extension to the detention of former Livedoor Co. President Takafumi Horie and four other ex-executives.

The Tokyo District Public Prosecutors Office served 33-year-old Horie and three other former Livedoor executives with the fresh warrants Wednesday on suspicion that they conspired to add 5.35 billion yen to the group's earnings results for the year to Sept. 30, 2004.

The three are former Livedoor Chief Financial Officer Ryoji Miyauchi, ex-Livedoor Director and Livedoor Marketing Co. President Fumito Okamoto, and former Livedoor Operating Officer and Livedoor Finance Co. President Osanari Nakamura, all 38.

The four men have been in custody since their Jan. 23 arrest.