Kolkata: The Detective Department of Kolkata Police has made a breakthrough in the case of the double murder at Netaji Nagar and arrested a mason in connection with the crime.”We have arrested one Md Hamruj Alam (38) from Barsoi, Katihar in Bihar. He has confessed that he had committed the crime. He had worked as a labourer at the house of the deceased persons. Some of the articles and cash stolen from the house have been recovered from his hideout,” said Murlidhar Sharma, Joint Commissioner of Police (Crime). Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataAlam was produced at a local court in Katihar and will be brought to Kolkata on transit remand by Monday. He ran away to his native village in Katihar after committing the crime and was hiding in the residence of one of his friends. The bodies of Dilip Mukherjee (80) and Swapna Mukherjee (72), a childless couple, were found at their residence in Netaji Nagar on July 30. A sleuth investigating the case informed that police zeroed in on the offender after scanning the CCTV footages available in and around the area. The police had earlier detained another labourer, but he was released after his connection with the case could not be established. Also Read – Lightning kills 8, injures 16 in state”The local residents had installed CCTVs in the area jointly for their safety and security. We accessed all these cameras and finally managed to identify the offender by showing the photograph to one of the contractors who sends labourers for various utility works at households,” a source in the Detective Department said. The sleuths are not ruling out the presence of more than one person during the crime. “We will seek custody of the arrested person and will interrogate him for further leads,” an investigating officer said. He added that murder for gain could be a motive but there are other angles to the case that need to be probed. The Mukherjee family had painted their house a few months ago and a number of labourers had worked there. Three such labourers were also detained and questioned, but nothing suspicious was found by the sleuths.