"We confirmed the voice of the narrator through voice recognition software," the Daily Star news quoted Counter Terrorism Unit Chief Monirul Islam as saying.
Thirty-year-old Tahmid Safi is the son of former Election Commissioner and Home Secretary late Safiur Rahman.
On July 1, gunmen belonging to the IS, killed 20 hostages -- mostly foreigners -- in a restaurant in Dhaka's diplomatic zone. Two police officers were also killed during the 12-hour-long siege.
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