Russian investigators said Wednesday several of the 30 Greenpeace activists already charged with piracy over their Arctic oil drilling protest were set to face additional charges for \"other grave crimes\". The Moscow-based Investigative Committee said the authorities had found \"narcotic substances\" on the Dutch-flagged Arctic Sunrise ship detained by Russia. Some of the equipment on the vessel is of \"dual purpose\" and \"could have been used not just for ecological purposes,\" investigators added.