Around 19 packages containing cocaine have washed up on Auckland's Bethells Beach.
It is believed to have a street value of approximately $3 million.
The packages were found last night and police were called to the area.
Police and Customs have undertaken a thorough search of the beach and surrounding areas to check for any other packages washed ashore.
"There is a small possibility that further packages may turn up on the beach and we ask any members of the public to contact us immediately if they do," detective inspector Colin Parmenter of Waitematā Police said.
An eagle helicopter will be in the area today to conduct a search of the wider area and regular police patrols will check for further washed up items over the coming days.
Anyone with information is asked to contact Waitematā Crime Squad on 09 839 0697. Alternatively, information can be provided anonymously to Crimestoppers on 0800 555 111.