"Three persons, two adults and a boy, were killed in a blast in a Maruti car. Their identity has not been ascertained yet," Bathinda Deputy Commissioner Ghanshyam Thori said.
It is not known what led to the incident. The car has been badly damaged, he said.
The blast occurred shortly after the road show of Harminder Singh Jassi, who is contesting from Maur assembly seat, police said.
Jassi is a relative of Sirsa-based Dera Sacha Sauda head Gurmeet Ram Rahim Singh.
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