Six Congress MLAs, led by Sudip Roy Barman, resigned from the party last and joined the Trinamool Congress.
The BJP on Sunday vowed to oust the Left from power in Tripura in the 2018 Assembly elections "to script history".
Over 84 per cent of the 27,651 electorate cast their votes on Wednesday in by-elections to 44 seats of three-tier panchayat system in Tripura, officials said.
Over a month-long hectic campaign for by-polls to two Tripura assembly seats ended on Thursday evening with opposition parties and ruling Left treating these by-elections as "prestigious electoral battle".
A senior Agartala government officer, missing and on the run for a fortnight after rape accusation, was arrested on Tuesday in neighbouring Assam`s Karimganj, police said.
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