Crime Branch ADG B K Sharma said a couple - Rahim Khan and his wife Aisha Begum have been identified as accused in the case, who murdered retired DI of schools Dinabandhu Mallick, his wife Nirmala and their two daughters aged ten and four.
"The motive behind the crime was economic gain," Sharma said.
Rahim Khan alias Himadri Das is a native of West Bengal and had married Aisha of Chhatisgarh. Both were residing at Raipur and were introduced to the deceased family through a relative, Sharma said adding, the couple had previously visited the Mallick family on several occasions.
After abandoning the motorcycle midway, the couple escaped to Raipur where they sold the ornaments and went to Bhopal.
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"From Bhopal, they went to Silchar in Assam via Kharagpur by train and were hiding at a place called Hailapur bordering Bangladesh from where they were arrested with the help of the local police," Sharma said adding, the accused were brought here on the day via Kolkata.
At least four crime branch teams comprising 25 officers did an excellent job to detect one of the challenging cases in which the accused had left no clues and eliminated all eye witnesses, Sharma said.