Besat Moni Chiran and her daughter Sujata Chiran were found dead in their residence in Gulshan on Tuesday
Four people have been detained in a case filed over the murders of two women in Dhaka.
Rapid Action Battalion (RAB) arrested them from Nalitabari area of Sherpur district on Wednesday.
RAB sources said detainee Shanjib Chiran was the mastermind of the murder.
RAB Media Wing Deputy Director Major Abdullah Al Mehedi confirmed the detention on Thursday.
Later, in a press briefing, RAB said the alleged killers went to the residence with the intention of stealing money for celebrating their religious festival “Easter Sunday.” They had been planning the theft for over a month.
According to the confession by the detainees, they murdered the victims when they thought the two would come in their way. After the murders, they searched the entire house for money. When they could not find any money, the four later left the house — locking the main entrance.
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Police recovered the dead bodies of Besat Moni Chiran, 65, and her daughter Sujata Chiran, 40, from their residence in Gulshan Tuesday evening.
In the first information report (FIR), Sujata’s husband Ashish Mankhin said: “Sanjib Chiran [Sujata’s nephew] killed my wife with a knife, and strangled my mother-in-law with the help of three associates.
“It was a pre-planned murder.”
Abu Bakkar Siddique, officer-in-charge of Gulshan police station, said they might have been murdered over a family feud, property issues, or sexual relations.