Oh my, I just saw this come across the wires. How can this happen again? Two Americans were kidnapped by armed pirates after their ship was attacked off Nigeria's coast, U.S. officials said Thursday. The U.S.-flagged oil supply vessel C-Retriever was targeted in the Gulf of Guinea early Wednesday, Reuters reported. The ship's captain and chief engineer were abducted. The seized vessel is owned by Louisiana-based Edison Chouest Offshore. The company was not immediately available for comment.