A Greenpeace statement says the arrests were made Wednesday in the Pechora Sea, a section of the Barents Sea. The activists, who climbed a platform belonging to state gas company Gazprom, are being held on a Russian Coast Guard ship, according to Greenpeace.
The statement said the Coast Guard fired 11 shots across the Greenpeace ship that brought activists to the area.
A spokeswoman for the Federal Security Service, which includes the Coast Guard, said she had no immediate information on the incident.