Staff Reporter :The case of the gruesome murder of two siblings in the city’s Banasree area has been transferred to the Detective Branch (DB) of police for further investigation. Deputy Commissioner (Media) of Dhaka Metropolitan Police (DMP) Maruf Hossain Sardar on Monday said that the case was shifted to the DB on Sunday night. He said the case had been transferred to the DB soon after getting directions from DMP headquarters regarding the matter, the DC said. The case handed over to the DB as law enforcers had suspicious about the killers and motive of the murders, the police official said. However, the mother, Mahfuza Malek Jasmine confessed to killing the two children once during initial interrogation by Rapid Action Battalion (RAB) and again in Police custody, but ‘without any emotion’, the law enforcers said.Nusrat Jahan Urmi of Viqarunnisa Noon School, and her younger brother Alvi Aman, a nursery student of Holy Crescent School at Banasree area, were found dead at their apartment on February 29.The family first claimed that they died after eating refrigerated Chinese restaurant food.However, the autopsies conducted on their bodies by the forensic department of Dhaka Medical College and Hospital found injury marks on the throat of Urmi and on that of Alvi and his one leg.Police detained four people-Pintu Das and Shaheen, caretakers of the house, victims’ relative Ferdous, Obaidul Islam, cousin of Mahfuza, and house tutor Sheuli Akter-the following day for questioning them over the death.Besides, a court asked the Criminal Investigation Department (CID) to conduct chemical tests on the food and water taken by the two siblings and permitted police to conduct DNA tests of the evidence, including pillow-cover, bed-sheet, tissue paper and blanket, collected from the room of the two children.On March 2, members of Rapid Action Battalion (RAB) detained Amanullah, Mahfuza and Afroza Malek, the father and mother, and maternal aunt of the two siblings, from Jamalpur district for quizzing them over the mysterious death of the two children.On March 3, briefing reporters at the RAB headquarters, its Director (Media) Mufti Mahmood Khan said during interrogation Mahfuza Malek revealed that she strangulated her daughter and son to death with a scarf as she was worried over their future and education.Amanullah, father of the two children, filed a case against their mother Mahfuza with Rampura Police Station On March 3.A Dhaka court put Mahfuza on a 5-day remand on March 4 over the murder of two siblings.Earlier in the day, police sought a 10-day remand for Mahfuza. Inspector (Operations) Mustafizur Rahman of Rampura Police Station, also investigation officer of the case, filed an application before the Metropolitan Magistrate Court seeking permission for taking Mahfuza Malek, the mother of the two kids, on a 10-day remand for interrogating her.