The detentions in September sparked international protests

A UN maritime tribunal has ordered Russia to free a Greenpeace vessel and 30 people detained after an oil drilling protest in the Arctic.

The court in the German city of Hamburg said a bond of 3.6 million euros ($5m) should be posted.

But a Russian statement issued after the ruling said the Hamburg tribunal had no jurisdiction in the case.

The Arctic Sunrise and its crew were detained two months ago. All but one of those held have now been granted bail.

An Australian activist, radio operator Colin Russell, remains in custody in St Petersburg; Greenpeace is to appeal against his detention next week.

The ship's captain, veteran American activist Peter Willcox, was among those freed on Friday. Eleven others were released earlier in the week.

Greenpeace said all those released had been moved to an undisclosed location in St Petersburg.

They were originally held in a jail in Murmansk where some activists had complained of being cold and of poor conditions.

It is still unclear whether they will now be allowed to leave Russia.

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