Armed gunmen seized two expatriate oil workers -- an American and a Briton -- during a raid on a Norwegian oil services ship off Nigeria's southern coast, officials and the oil company said Thursday. The two were seized before dawn from a vessel belonging Oslo, Norway-based Petroleum Geo-Services, said company official Christopher Mollerlokk. "I can confirm that two employees were kidnapped. One is a U.K. national and the other an American," Mollerlokk said by telephone from Oslo. He gave no further details, the Associated Press reported.