Paul Watson, founder of the Sea Shepherd Conservation Society, made...

Paul Watson, founder of the Sea Shepherd Conservation Society, made famous by the television show "Whale Wars", talks with media at his home office in Woodstock, Vt. on Aug. 23, 2016. Credit: AP/Lisa Rathke

COPENHAGEN, Denmark — A court in Greenland ruled Wednesday that anti-whaling campaigner Paul Watson must remain in detention until Oct. 23 while Denmark’s Justice Ministry decides whether to approve his extradition to Japan.

It was unclear when Denmark will decide whether to send him to Japan, where he is accused of obstructing a whaling research ship's work with violence in 2010. He could face up to 15 years in prison if convicted in Japan.

“They have deliberately thrown such objects so it is to harm people,” prosecutor Mariam Khalil said in court, according to the Greenland newspaper Sermitsiaq, referring to potassic acid thrown at the Japanese vessel by Watson's team.

Julie Stage from Watson’s legal team said they were “disappointed” by Wednesday’s ruling.

Watson, a 73-year-old Canadian-American citizen, is a former head of the Sea Shepherd Conservation Society whose direct-action tactics, including high-seas confrontations with whaling vessels, have drawn support from A-list celebrities and were featured in the reality television series “Whale Wars.”

Watson was arrested on July 21 when his ship docked in Nuuk, Greenland’s capital.

Greenland is an autonomous territory of Denmark and handles police and justice matters. Japan does not have an extradition treaty with the Scandinavian country.

Japan’s coast guard sought his arrest following an encounter with a Japanese whaling research ship in 2010. He was accused of obstructing the crew’s official duties by ordering the captain of his ship to throw explosives at the whaling ship.

His foundation posted Wednesday on X a video of Watson in his cell in Nuuk, where he said: “In 50 years, I have not caused a single injury to a single person. I have operated within the boundaries of international law and within boundaries of practicality.”

“I am confident that once the evidence here is reviewed by the appropriate authorities, there will be no grounds to honor Japan's request for extradition,” Watson said.

Whale meat has always been an element of Japanese food culture, and the Japanese government says it supports the sustainable use of whales.

Watson, who left Sea Shepherd in 2022, was also a leading member of Greenpeace, but left in 1977 after disagreements over his aggressive tactics and set up the more action-oriented organization. The group has waged aggressive campaigns to protect whales, dolphins and other marine animals.

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Newsday Live presents a special evening of music and conversation with local singers who grabbed the national spotlight on shows like "The Voice," "America's Got Talent,""The X-Factor" and "American Idol." Newsday Senior Lifestyle Host Elisa DiStefano leads a discussion and audience Q&A as the singers discuss their TV experiences, careers and perform original songs.

Newsday Live Music Series: Long Island Idols Newsday Live presents a special evening of music and conversation with local singers who grabbed the national spotlight on shows like "The Voice," "America's Got Talent,""The X-Factor" and "American Idol." Newsday Senior Lifestyle Host Elisa DiStefano leads a discussion and audience Q&A as the singers discuss their TV experiences, careers and perform original songs.

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