Zanzibar's incumbent president was sworn in for a second and final term Wednesday, a day after the electoral commission declared him and his party the winners of general elections. President Amani Abeid Karume took an oath of office at the House of Representatives of this semiautonomous Indian Ocean archipelago, inspected a guard of honor and took a 21-gun salute as anti-riot police, supporters and the merely curious stood outside. Seif Shariff Hamad of the main opposition Civic United Front said five supporters died on the Zanzibar second island, Pemba, during protests on Tuesday. A member of the government security force said four of his colleagues were killed on Pemba. He spoke on condition of anonymity because he was not authorized to talk to the media. Karume, of the ruling Chama Cha Mapinduzi, won 53.2 percent of the vote, while Hamad had 46.1 percent, according to electoral chief Masauni Yussuf Massauni. Of the 50 seats up for election in the House of Representatives, the Chama Cha Mapinduzi was declared the winner of 30 seats and the Civic United Front won 19. Results for one seat were nullified because of irregularities. Hamad, speaking on the main island, Unguja, rejected the results and vowed to launch a civil disobedience campaign similar to one that toppled the government in Ukraine last year, the Associated Press reported.