Police found 19 packages containing cocaine worth an estimated $1.9 million (New Zealand $3 million) on the isolated Bethells Beach, on Auckland's west coast, police said in a statement Thursday. A caller had informed them of the packages on Wednesday evening.
Police said there was a "small chance" more packages could wash up on the beach.
Authorities are still working to determine where the drugs came from. A helicopter will search the area Thursday, and regular police patrols will monitor beaches.
Bethells Beach is a popular nature spot where Swift filmed the music video for "Out of the Woods," a single from her album "1989," in 2015. Swift reportedly described Bethells as "the most beautiful beach" she had ever visited at the time.