CRPF jawan Narayan Chandra Pradhan, who hails from Odisha's Jajpur, died in the mishap last night along with another jawan, the EC officials said.
A polling personnel Vishnu Rawat, who works as a bank clerk, was also killed in the accident, they said.
Four persons were also left injured in the incident. The driver is in a critical condition in the Siliguri hospital, officials said.
The commission has expressed its deep condolences to the family of the deceased.
During the day, EC officials held a video conference with all observers and senior police officers to review poll preparedness for the third phase on April 21.