The Tokyo District Court on Saturday gave investigators permission to detain Fusako Shigenobu, the founder of the Japanese Red Army guerrilla group who was arrested Wednesday after almost 30 years on the run, for 10 days.
Shigenobu was arrested on suspicion of conspiring with three comrades to confine the French ambassador and 10 other members of staff at the French Embassy in The Hague in 1974, and of being responsible for the attempted murder of two policemen who suffered gunshot wounds during the incident.
Police said she is accused of conspiracy, although she was not at the scene of the incident.
Saturday's court decision is in line with the Code of Criminal Procedure, which compels prosecutors to obtain permission to detain suspects for 10 days within 24 hours of their transfer by police.
The Tokyo Metropolitan Police Department handed Shigenobu over to the Tokyo District Public Prosecutors Office on Friday.
Of the three other Japanese Red Army members involved, Haruo Wako and Jun Nishikawa are on trial, while Junzo Okudaira is still on an international wanted list.
Shigenobu was taken into custody Wednesday after being apprehended on a street in Osaka Prefecture.
The guerrilla group was behind a number of terrorist incidents in the 1970s.
Armed members fired at a crowd of people at Lod airport in Tel Aviv, Israel, in 1972, killing about 25 people. In 1975, members of the group seized the U.S. and Swedish embassies in Kuala Lumpur.
Shigenobu left Japan in 1971 for Lebanon, establishing the group there soon afterward.