Anushka Noor Amin, 'O' level student of Mastermind School, died due to excessive bleeding for using a foreign body for perverted sex, according to the Criminal Investigation Department (CID) of police.
Additional Deputy Inspector General of CID Cybercrimes Command and Control Centre M Quamrul, came up with the information at a press conference at the CID head office on Sunday.
He said Anushka bled profusely due to perverted sex.
Citing experts, the CID official said a foreign body was used during the sex.
He also said they arrested seven people dealing in adult sex toys in the country.
Anushka died from excessive bleeding after rape in the city's Kalabagan area on January 7.
Victim's mother said Fardin Iftekhar Dihan called the girl to his house on the day in the name of group study where she was raped.
As she was bleeding profusely, the accused took her to Anwer Khan Medical College Hospital where she was declared brought dead.
Meanwhile, victim's father filed a murder case with Kalabagan Police Station in the early hours of the following day.
A court also sent Dihan to jail on January 8 after he made a confessional statement before it.