Police thanked the public and media for their assistance in the case, which has led police to follow up new lines of enquiry.
The news was taken hard by the 20-year-old's family.
Ramandeep Bajwa, whose wife Sweety is Mr Singh's cousin, said a group of family and friends were keeping vigil at his home, waiting to hear any news.
"There is only hope right now," Mr Bajwa said.
"[We're] not good, still waiting. We're hoping it turns out he was not there. That's what we are hoping."
* Anyone with information on Mandeep Singh's whereabouts, or who saw him in Viaduct area after 3am on Sunday, is asked to contact police on 09 302 6557.
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