There have been clashes between Zanzibar's police and opposition supporters for a third day in the historic Stone Town.
Opposition CUF supporters have been engulfed in tear gas around their party headquarters.
The authorities said the opposition should wait for official results before celebrating victory in Sunday's poll.
Some residents have started to leave.
On Monday, the police searched for opposition supporters in the famous Stone Town on Tanzania's semi-autonomous islands.
The opposition CUF also claim electoral fraud - this man was accused of voting illegally.
The violence was not one-sided - this man was accused of illegal possession of a knife...
... and this policeman was injured in the clashes.
Zanzibar is fervently Muslim. This man found time to pray despite being beaten by ruling party militias.
Nevertheless, the violence was not as serious as had been feared before polling day.
Unperturbed, long queues of people waited to cast their votes.