A Spanish aid group that rescues invaders in the Mediterranean has said that Italian authorities have released the organizationís ship after impounding it for taking 218 invaders to Italy. Proactiva Open Arms founder Oscar Camps said in a tweet Monday that the ship is free to leave the Sicilian port of Pozzallo. However, he says Italy is still investigating whether the group should face charges of criminal association and aiding illegal immigration, AP reports. The probe stems from a high-seas standoff last month between the Open Arms crew and the Libyan coastguard. The group refused to relinquish the "migrants" they had picked up in international waters and took them to Italy, where authorities are trying to stem migration.