Det Snr Sgt Croudis said a large team of investigators have worked extensively on this case, but there is still work to do.
Several vehicles, another residential property and workplaces are still part of the ongoing investigation, Det Snr Sgt Croudis said.
“The hours of work put in by members of Environmental Science and Research, both at the scene and the laboratory, have been invaluable in assisting Police,” Det Snr Sgt Croudis said.
“We wish to thank members of the public for their information and CCTV footage provided, which has helped greatly with the investigation.”
Police said Singh’s father is currently in Dunedin and is being supported by Police and the Punjabi community.
“Our thoughts remain with the family at this extremely difficult time,” Det Snr Sgt Croudis said.