The police found two severed heads in a cooler at the entrance of the apartment, before the other gruesome discoveries Tuesday, according to Jiji. The two were spotted on security camera footage nearby the suspect's apartment, Japanese public broadcaster NHK reports.
Shiraishi admitted to murdering them and cutting up their bodies, the sources said.
Police are now investigating to determine whether Shiraishi, who was arrested on suspicion of body disposal, killed the woman and the other eight victims.
The Metropolitan Police Department on Tuesday arrested the apartment's resident, Takahiro Shiraishi, 27, on suspicion of abandoning bodies sometime between August 22 and Monday.
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Shiraishi is now being held on a charge of discarding a body, and police are expected to file murder charges soon, Kyodo said.
The images of the japanese television showed a massive police presence blocking the outskirts of a big house where is located the apartment. "I dismembered the corpses in the bathroom", Shiraishi was quoted.
Although mystery still shrouds about the identification of dead bodies but media reports suggested that the bodies were of eight women and one man.
Police will conduct DNA tests to conclusively identify the victims, the website reported.
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The woman's brother reported her missing to police on October 24, three days after last speaking with her.
The apartment is in a residential area along the Odakyu Odawara Line, about 600 meters from Sobudai-mae Station.
Some residents living in the same building as Shiraishi said they noticed a foul smell coming from his room from around August.
"I thought it smelled like sewage", one neighbor said. In July 2016, a 27-year-old former employee at a care home for the disabled killed 19 people and injured more than 20 in a knife attack. In 2015, a man killed five people, including relatives and neighbors, in a knifing spree in western Japan, and was later sentenced to death.
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He said law enforcement "is following" the attack closely before adding: "NOT IN THE USA!" We thought it was a Halloween thing. That's the corner I was supposed to have my coffee but my dog pulled me into the park half a block away 10 min before shooting.