Moscow, Sha'ban 20, 1436, Jun 7, 2015, SPA -- Ukraine's border guards service says one of its cutters exploded while on patrol off the shore of the strategic port city of Mariupol. Two of the seven servicemen on board were injured and the status of the others has not been determined. It wasn't immediately clear what caused the explosion Sunday afternoon, AP reported. --SPA 21:57 LOCAL TIME 18:57 GMT www.spa.gov.sa/w