A polling supervisor was gunned down by alleged Maoist militants in the eastern state of Odisha on Wednesday.
The supervisor, Sanjukta Digal was leading a team to a polling station in the Kandhamal district on the eve of the second phase of voting in the state.
An improvised explosive device was detonated as polling officials were traveling towards a polling booth for an inspection.
“They tried to blow up the vehicle but did not succeed in that and then they open fired,” said Sanjeeb Panda, senior Odisha police official.
The state's Chief Minister Naveen Patnaik tweeted that he was "deeply anguished" by the attack and offered his condolences.
In another incident in the same district of Kandhamal, alleged Maoists approached a vehicle heading towards a polling centre, forced officials to disembark before setting fire to the vehicle, said Panda.
Maoist attacks in Chhattisgarh, Odisha and Jharkhand are common during election season as they attempt to dissuade voters from casting their ballots.
Last week, five people including a Bharatiya Janata Party legislator were killed in Chhattisgarh in a bomb attack as they were returning from an election rally.
The police had attributed the attack to Maoist rebels in the region.
Indian Maoist -- or Naxalite -- groups have been active in the country since the 1960s, but the modern insurgency did not begin until the early 2000s with the emergence of the Communist Party of India (Maoist) and its armed wing, the People's Liberation Guerrilla Army. More than 2,100 civilians in India have been killed in the Maoist insurgency since 2010.
Voting is currently underway as scheduled in the Odisha district and more security has been provided at the booths.