Greenpeace announced Friday that it would organize protests in different countries to demand that Russia release its Arctic Sunrise ship and 25-member crew.

"We've called on all our offices to join the protest against (Thursday's) seizure of the ship. The delegations in Finland, Switzerland and Germany have already confirmed they will participate," the coordinator of Greenpeace Russia's Arctic program, Yevgenia Belyakova, told Efe.

The protests will take place Friday outside the foreign offices of Russian state gas monopoly Gazprom, which is prospecting for oil and gas in Arctic waters, she said.

The international environmental watchdog's Moscow office has been unable to communicate with the Arctic Sunrise's crew since Thursday night, when it learned that Russian coast guard personnel had boarded the vessel, Belyakova added.

Russia's FSB intelligence service, meanwhile, said in a statement that it had decided to tow the icebreaker to the northwestern port of Murmansk.

Legal action also is being prepared against the ship's crew, the Interfax news agency reported, citing the FSB's statement.

On Tuesday, the Russian coast guard fired warning shots after members of the Arctic Sunrise's crew tried to tie themselves to Gazprom's Prirazlomnaya rig to protest the company's oil exploration activities.

Gazprom's plans to begin oil production with that rig in the first quarter of 2014 increase the risk of an oil spill in an area that contains three natural reserves protected under Russian law, according to Greenpeace.

In late August, the Arctic Sunrise was intercepted by Russian coast guard personnel in the Kara Sea, where Greenpeace was trying to shed light on the work of seismic vessels preparing the way for oil production in the Arctic. EFE