Staff Reporter :Police is yet to make any headway in the investigation of the murder case of the two siblings in the city’s Banasree area.The investigators are trying to probe the incident to contend the multi-dimensions related sides regarding the murder, detective sources said. The cop members could not be sure about the killer and the motive of the killing, they said. The investigation into the murder case has become complicated as the investigators could not get reliable information from the accused mother and detained persons in this connection. Meanwhile, a Dhaka court on Wednesday placed Mahfuza Malek Jasmine on a fresh five-day remand in connection with murder of her two children in Banasree area.Additional Chief Metropolitan Magistrate Alamgir Kabir Raj passed the order after Lokman Hakim, an inspector of Detective Branch and also investigation officer of the case, sought her in 10-day remand for interrogation. On March 4, Mahfuza was placed on a five-day remand in the first phase. Nusrat Aman Aroni, 14, and her brother Alvi Aman, 6, were found unconscious at their apartment and declared dead at Dhaka Medical College Hospital on February 29.Three days later, Rapid Action Battalion (RAB) told the press that they had been killed by their mother out of her “concerns about their future.” And Mahfuza made up a food-poisoning story to cover it up.According to RAB, she first strangled her daughter Nusrat and then son Alvi. Following the revelation, the father of the siblings Amanullah filed a case against his wife. So far, five people have been picked up for questioning in this regard.