A low turn-out characterized a re-run of an election for the president of Zanzibar, the semi-autonomous archipelago off the coast of Tanzania, as opposition parties boycott the poll.

Zanzibar's main opposition party, the Civic United Front, and its ally, CHADEMA, are not participating in the re-run claiming it is against the electoral laws and constitution of Zanzibar.

The electoral commission annulled results of elections in October that the Civic United Front believes it won.

Nassor Mazrui, the Civic United Front's secretary general, says the party will not participate in Sunday's election because its members believe the nullified results were legitimate. President Ali Mohamed Shein of the Revolution Party of Chama Cha Mapinduzi is seeking re-election.