A circular signed by Election Commission Deputy Secretary Afroza Shiuli was issued in this regard on Wednesday.
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The first-class magistrates will start working two days before the polls and will be deployed until Jan 29, two days after the election, the circular said.
The CCC election is scheduled to be held on January 27. A total of 236 aspirants are contesting the polls, including seven mayoral candidates.
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There are 1,938,706 voters in the city corporation area.