The case is scheduled to return to court on Thursday and the U.S. warrant remains officially registered with the Fiji courts, she said.
"The yacht has been further restrained from leaving the Fiji waters until further notice," she added.
"It is in Fiji police custody at this point."
The United States says Kerimov, who has made a fortune as part-owner of major Russian energy and financial companies, including Gazprom and Sberbank, is also an official of the Russian government.
In a publicly released copy of the warrant, the section listing various reasons to believe Kerimov is the yacht's true, beneficial owner was partly blacked out.
The warrant said ownership was transferred to Millemarin Investment in August 2021.
