Main opposition Bangladesh Nationalist Party (BNP) of former prime minister Khaleda Zia took the mayor seat at Gazipur, the largest corporation in the country, with a margin of 1,06,577 votes.
"I declare M A Mannan elected unofficially," the returning officer announced the name of the winning candidate as the counting of votes was completed early today morning.
"The margin of Mannan's victory over Awami League's Ajmat Ullah Khan was 1,06,577 votes," he added.
Gazipur, which was declared a city corporation only recently and is holding its first mayor elections, is the largest of municipal bodies in Bangladesh with 1,026,938 registered as voters.
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"This was an expected result which actually reflected the people's mind against ruling Awami League misrule," Mannan said after winning the election.
Earlier, Khan termed the voting peaceful while Mannan accused his rivals and election officials of rigging the polls even as voters queued up to exercise their franchise.
Prime Minister Hasina has declined to accept this demand saying the general elections should not be held under a non-elected government.
"Unless the trend is bucked, the party (Awami League) that led the country's liberation struggle and ruled Bangladesh for one-third of its time as an independent nation, may have to prepare for rejection and oblivion (in the coming general elections)," read an analysis by an online newspaper after declaration of the election result.