And two senior members of the cult were arrested after they allegedly attacked a policeman, Kyodo News Service reported.
Dr. Ikuo Hayashi, the top doctor at a cult-affiliated hospital, was arrested on suspicion of illegally confining a 23-year-old woman from December, when she asked to leave the group, until March 22, when police began raiding cult compounds.
Kyodo reported the woman was beaten and anesthetized at the cult’s Mount Fuji complex.
Police earlier had arrested three other doctors at the small Tokyo hospital run by the Sublime Truth cult.
In raids on cult properties across Japan, police have hauled away truckloads of chemical lab equipment, medical gear, gas masks and tons of chemicals that appear to include the ingredients for sarin and its antidotes.
Sarin was the gas used in the March 20 attack on the Tokyo subway that killed 11 people and sickened thousands.
No one has been arrested in the subway attack or the shooting of the national police chief, who had been overseeing a cult investigation.
The cult denies any link to either crime.
On Thursday, two cult leaders were arrested after refusing to cooperate when police tried to question them, Kyodo said.
One was identified as Shinichi Koshikawa, 30. Kyodo said he is under investigation in connection with the February abduction of a man the cult allegedly was trying to shake down for $240,000 in exchange for allowing his sister to leave the cult. Koshikawa heads two companies owned by the cult.
The other person arrested was not identified.