Pirates kidnapped 12 crew members from a Swiss merchant vessel on Saturday in Nigerian waters, the shiprsquo;s operator said in a statement. Kidnapping for ransom is a common problem in parts of Nigeria. A number of foreigners have been kidnapped in the last few years in the southern Niger Delta region, source of most of the crude oil which is the mainstay of West Africarsquo;s biggest economy. Massoel Shipping, operator of MV Glarus, said the vessel carrying wheat was travelling between the......