The murders of two Garo women were planned a month ago to loot their house in Gulshan for money and valuables, Rapid Action Battalion said.
“The killers had a plan to celebrate the festival ahead with the loot,” Mufti Mahmud Khan, Rab's legal and media wing director, told reporters yesterday after the arrest of four suspects at Jhenaigati upazila in Sherpur on Wednesday afternoon.
Sanjib Chiran, nephew of one of the victims, planned the murders with three other arrestees -- Razu Sangma alias Russell, 24, Prabin Sangma, 19, and Shuvo Chisim alias Shanto, 18.
The four arrestees belonging to the same community were planning to escape the country by trespassing the border in Sherpur. “They admitted their involvement in the killings,” Mufti said.
Based on their information, Rab recovered a knife from near Abdullahpur bus stand where they dropped it before leaving Dhaka after the killings.
On Tuesday, the bodies of Sanjib's aunt Sujata Chiran, 40, and her mother Besat Moni Chiran, 65, were recovered from their flat around 8:00pm.
The killers confirmed Sujata's death by 14 stabs in her back, chest and hands, while Besat was strangled, according to Rab and sources in the morgue at Dhaka Medical College.
As per their plan, Sanjib, Shanto and Prabin arrived in Dhaka from Sherpur on Monday and met hotel employee Rajuin in Kuril area. That night they stayed at the house of Raju's friend in Uttara, Mufti Mahmud told a briefing at Rab Media Centre in Karwan Bazar.
Sanjib collected a knife from Razu and all four went to the victims' house in Kalachandpur in Gulshan around 9:00am on Tuesday.
Prabin and Razu went to the victims' house on the third floor of the building and pretended to look for Sujata's husband so that they could learn about the house.
Seeing many people inside, they came out and informed it to Sanjib. After waiting for hours nearby they entered the house again around 3:30pm when they found Sujata and her daughter Mayabi inside, Mufti said.
Sanjib, who lived with the family for a month about one and a half years ago, introduced his three accomplices as his friends. After having snacks, he proposed Sujata to drink local alcohol. By this time, Mayabi left the house for her job.
The four and Sujata went on to take alcohol. At one stage, Sujata fell dizzy and lied on the bed and Besat arrived there from another room.
The four decided to kill Besat. Razu held her legs, Shanto pushed a pillow on her mouth and Sanjib strangled her with a scarf, the Rab official said. After the murder they hid the body under the bed, he added.
After killing Besat, they went to Sujata's room. Sanjib sat on her and stabbed her indiscriminately when another killer pushed a pillow on her face.
Razu collected a knife from the house and stabbed her with it, while Sanjib confirmed her death by slitting her throat.
The killers searched the house for money and valuables before leaving. They returned to Sherpur and planned to trespass the border as Mayabi had seen them minutes before the murder.
Sujata had been living in the flat along with her mother, husband, two daughters and a granddaughter for the last two years. As all the family members are working people, the killers thought there would be a hefty amount of money in the house, Rab said.
The elite force added they would investigate whether there were any other motives behind the murders.
A case was filed with Gulshan police on Wednesday accusing Sanjib and three other unidentified people.