Additional Director General of Police Ravinder Kumar said the injured security personnel were admitted to a hospital.
After the incident, the Jamui district administration cancelled election at 12 polling booths.
Security forces also recovered two IEDs from the spot.
Also, five cane bombs - two in Gaya and three in Aurangabad parliamentary constituencies - were recovered from near polling booths.
In another incident, Maoists blasted a state-run school in Bihar's Lakhisarai district, police said, adding three live cane bombs were also recovered from the school premises.
