"Polling in Bastar seat started at 7 am and is going on smoothly. Till 9.30 am, around 14 per cent polling has been registered," he said.
Long queues of voters were seen at several polling booths in the region.
No casualty was reported in the blast.
A thick security blanket, comprising around 80,000 state and paramilitary personnel, was thrown across the constituency to ensure peaceful polling.
The voting time in the other four Assembly segments - Bastar, Chitrakot, Kondagaon and Jagdalpur - of the constituency is from 7 am and 5 pm, he said.
Seven candidates are in fray in the seat and as per electoral rolls, there are 13,72,127 voters, including 6,59,824 men, 7,12,261 women and 42 of the third gender.
Of the 1,879 polling booths in the constituency, 741 have been marked as hyper-sensitive and 606 as sensitive in view of the threat of Naxalism.
The saffron party has never lost the Bastar seat since 1998.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)