Japanese police have found nine bodies, including two with their heads severed and dumped in a cool box, in a flat in the Tokyo suburbs, media reported on Tuesday.
Police have arrested 27-year-old Takahiro Shiraishi, who lives in the apartment in Zama, south of Tokyo, public broadcaster NHK said.
A police spokesman could not immediately confirm the reports.
Authorities had been investigating the disappearance of a 23-year-old woman and discovered a connection between her and Shiraishi.
According to Jiji Press, police found the two heads inside a cool box at the entrance of the apartment on Monday before making the grisly discovery of the other bodies inside on Tuesday.