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Election chief: Results of Zanzibar's presidential poll nullified over irregularities

  • In this photo taken Monday, Oct. 26th, 2015 and made available Wednesday, Oct. 28th, 2015, youths supporting the opposition party dance and chant, predicting a win for their candidate, outside the Electoral Commission office in Stone Town, Zanzibar, a semi-autonomous island archipelago of Tanzania. Zanzibar's election commission chief announced Wednesday that the results of the island archipelago's presidential election have been nullified because of alleged irregularities, saying that the decision was taken because of several issues with the voting process, but did not say when another election would take place. (AP Photo)

    In this photo taken Monday, Oct. 26th, 2015 and made available Wednesday, Oct. 28th, 2015, youths supporting the opposition party dance and chant, predicting a win for their candidate, outside the Electoral Commission office in Stone Town, Zanzibar, a semi-autonomous island archipelago of Tanzania. Zanzibar's election commission chief announced Wednesday that the results of the island archipelago's presidential election have been nullified because of alleged irregularities, saying that the decision was taken because of several issues with the voting process, but did not say when another election would take place. (AP Photo)  (The Associated Press)

  • In this photo taken Monday, Oct. 26th, 2015 and made available Wednesday, Oct. 28th, 2015, police special forces ride in the back of a vehicle with unidentified men they had arrested, in the Darajani area of Stone Town, Zanzibar, a semi-autonomous island archipelago of Tanzania. Zanzibar's election commission chief announced Wednesday that the results of the island archipelago's presidential election have been nullified because of alleged irregularities, saying that the decision was taken because of several issues with the voting process, but did not say when another election would take place. (AP Photo)

    In this photo taken Monday, Oct. 26th, 2015 and made available Wednesday, Oct. 28th, 2015, police special forces ride in the back of a vehicle with unidentified men they had arrested, in the Darajani area of Stone Town, Zanzibar, a semi-autonomous island archipelago of Tanzania. Zanzibar's election commission chief announced Wednesday that the results of the island archipelago's presidential election have been nullified because of alleged irregularities, saying that the decision was taken because of several issues with the voting process, but did not say when another election would take place. (AP Photo)  (The Associated Press)

  • Armed Tanzanian police stand guard outside a vote counting center at Maji Matitu Primary School in Mbagala, in the Temeke district of Dar es Salaam, Tanzania Wednesday, Oct. 28, 2015. Tanzanians voted on Sunday in a presidential race that is the most tightly contested since the country became independent in 1961, with the ruling party being challenged by a former member who was recently the country's prime minister. (AP Photo/Khalfan Said)

    Armed Tanzanian police stand guard outside a vote counting center at Maji Matitu Primary School in Mbagala, in the Temeke district of Dar es Salaam, Tanzania Wednesday, Oct. 28, 2015. Tanzanians voted on Sunday in a presidential race that is the most tightly contested since the country became independent in 1961, with the ruling party being challenged by a former member who was recently the country's prime minister. (AP Photo/Khalfan Said)  (The Associated Press)

Zanzibar's election commission chief says the results of the island archipelago's presidential election have been nullified because of alleged irregularities.

Jecha Salim announced Wednesday that the decision was taken because of several issues with the voting process. He did not say when another election will take place.

Tensions have been rising in Zanzibar since the Civic United Front, the main opposition party, claimed Monday that its candidate had won, days before the official results. The Civic United Front's candidate for president, Maalim Seif Hamad, asserted he won the election with more than 52 percent of the votes. His statement did not say how he had arrived at the result.

The Zanzibar island archipelago is a semi-autonomous part of the United Republic of Tanzania, whose presidential election results are expected Thursday.