Police have arrested a couple in Khulna in a case over the murders of a man and his nine-year-old daughter in Dhaka's Badda.
Police say an extramarital affair between Arjina Begum, the wife of the murdered man, Jamil Sheikh, 38, and their sublet tenant Shaheen Mollik led to the killings.
Police tracked down Shaheen and his wife Masuma Begum on Friday by mobile phone following information given by Arjina, who is now in police custody, Dhaka Metropolitan Police Senior Assistant Commissioner Ashraful Kabir told bdnews24.com.
Police arrested the couple at Batiaghat of Khulna early Friday.
Shaheen and Masuma rented a portion of the rooftop flat where Jamil lived with his wife, daughter Nusrat Jahan and their five-year-old son four months ago.
The two families had earlier lived in separate flats at another building, where the relationship developed between Shaheen and Arjina, police officer Ashraful said.
"Masuma was not aware of the relationship first. But she too got involved later," Ashraful said.
Jamil's brother Shamim Sheikh started a case against Arjina and Shaheen on Thursday night after the bodies were found in the morning, Badda Police Station OC Kazi Wazed Ali said.
Jamil, a driver, worked for a Gulshan resident. Nusrat was a student in the second grade of a local school.
In the case, Shamim alleged Arjina and Shaheen hit Jamil in the head with a heavy object and strangled Nusrat.
Sub-Inspector Shakhawat Hossain, who made the first inquest reports, said there were six marks of wounds on Jamil's head.
