The fire started around 1:45pm, the Fire Service said
Polls opened simultaneously in 170 voting centres across Boalkhali Upazila and the port city at 9 am on Monday. Electronic voting machines or EVMs are being used at the election.
Over 450,000 voters will cast ballots for a new representative in parliament until 5 pm.
The Chattogram-8 constituency comprises the Boalkhali Upazila and parts of Chattogram city's Chandgaon and Bayezid areas.