They were detained after a protest at a Gazprom oil platform in the Black Sea . Police said two activists tried to hang a banner from a rig . ' : The action endangered lives , and could have led to an environmental disaster . The activists are ` ` accused of an imaginary crime , '' a Greenpeace spokesman says .
30 were detained after a protest at a Gazprom oil platform in the Barents Sea . Greenpeace says two activists tried to hang a banner from a rig . Russia : The action endangered lives , and could have led to an environmental disaster . The activists are `` accused of an imaginary offense , '' a Greenpeace official says .