The latest news on this front comes from British Broadcasting Corporation
Demonstrators were dragged away from the city hall as security forces used batons against the crowd.
People were protesting against the exclusion of opposition candidates from local polls. The opposition say they were barred for political reasons.
Some of the candidates banned from standing in the 8 September election had been detained earlier.
Officials disqualified about 30 people, saying they had failed to collect enough valid signatures to stand.
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