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 . `` There can be no doubt about why the charge of piracy has been brought and the legal hammer wielded . The activists are ` ` accused of an imaginary crime , '' a Greenpeace spokesman says .
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 .