Dantewada: Four persons, including a Central Industrial Security Force personnel, were killed on Thursday in an IED blast triggered by Naxals on a bus near Bacheli in Dantewada in poll-bound Chhattisgarh.

Apart from the CISF jawan, the deceased include the driver, conductor and cleaner of the bus, Dantewada Superintendent of Police Abhishek Pallava said.

The explosion took place in a hilly area in Bacheli in Dantewada when the personnel were returning to their camp after purchasing groceries from market, he said.

Seven people, including four civilians and three CISF personnel, were travelling in a bus when they were attacked, said the police.

The personnel belonged to a CISF unit that has been deployed in the area for the first phase of the forthcoming polls in the state.

The attack comes just four days before the state goes to polls.

On October 30, Maoists attacked a police patrolling party accompanying a three-member team of national broadcaster Doordarshan for election related coverage, near Nilawaya village under the Aranapur police station limits of Dantewada district.

Sub Inspector Rudra Pratap Singh, assistant constable Manglu and the cameraperson of Doordarshan Achyutanand Sahu were killed on the spot.

The outlawed CPI (Maoist) claimed the responsibility for the attack, but said it did not intend to target the media.

In a statement, purportedly issued by the group and circulated on social media, the Maoists also asked media persons not to be escorted by police while visiting the conflict zone.

The Maoists alleged in the statement that police was forcibly carrying out road construction work between Aranpur and Burgum (Dantewada), although it was opposed by local villagers.

Assembly polls in Chhattisgarh will be held in two phases on November 12 and 20. Eighteen constituencies spread across eight Naxal-hit districts will go the polls in the first phase, and the remaining 72 seats in the second phase.