BERN, Switzerland - Prosecutors on Wednesday opened an investigation into two Swiss citizens suspected of illegally exporting nuclear-bomb-making technology to Libya, a spokesman for the prosecutors office said. The spokesman, Hansjuerg Mark Wiedmer, declined to identify the suspects. But one investigative source, speaking on condition of anonymity, said one was Swiss engineer Urs Tinner, who was arrested in Germany last week. The Swiss agency that polices adherence to international sanctions disclosed in February that it had opened an investigation to determine whether Tinner had broken Swiss law by making precision parts in Malaysia that were destined for Libya. He is...