Waitematā Police are continuing to appeal for the public's assistance in locating Eloi Jean Rolland.
The 18-year-old French national was reported missing to Police a week ago.
Detective Senior Sergeant Murray says the last confirmed sighting of Eloi remains at 7.26am on Saturday 7 March at the Fruitvale Road railway station in New Lynn.
Enquiries on Eloi's mobile phone indicate he was in the area of Piha Road at 9:18am on Saturday 7 March.
Detective Senior Sergeant Marcia Murray says a Search and Rescue team began conducting a search around the Piha Road area yesterday afternoon.
"This search effort has been scaled up today, with the SAR team conducting land-based searches in the Piha area.
"We are urging anyone that lives in the Piha area that may have seen Eloi on Saturday 7 March to contact Police.
